Liabilities / Assets
52nd percentile
Higher debt load relative to assets than 52% of similar nonprofits.
EIN 04-2129139 • 501(c)3 • Nantucket, MA
Profile
The mission of the association is promotion of the legacy of maria mitchell and exploration, education and enjoyment of nantucket's land, waters and skies beyond. In fulfilling the mission they recognize the historic persona of maria mitchell, the foremost american woman scientist and educator of the 19th century, and her potential impact on contemporary thought by passing on her legacy of intellectual curiosity, respect for and love of nature, learning by doing, and the ideal of individualism. The association's contributions to astronomy, science, and education are the basis for their continuing tradition of high quality research and teaching which inspires today's learners and tomorrow's scientists. The association also provides scientific resources and educational programs for the community, uses nantucket island as an exceptional natural laboratory in which to study science and the environment, and maintains research and/or representative collections of nantucket's biodiversity.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
52nd percentile
Higher debt load relative to assets than 52% of similar nonprofits.
Liabilities / Revenue
75th percentile
Higher debt load relative to revenue than 75% of similar nonprofits.
Net Margin
72nd percentile
Higher net margin than 72% of similar nonprofits.
Top Officer Pay
81st percentile
Higher top officer pay than 81% of similar nonprofits.
Top officer pay equals 7.6% of source-year revenue.
Asset Growth
68th percentile
Faster asset growth than 68% of similar nonprofits.
Revenue Growth
83rd percentile
Faster revenue growth than 83% of similar nonprofits.
Assets
Up$14,017,665
Up $1,449,283 (+12%) from 2023
Liabilities
Up$2,799,351
Up $3,660 (+0.1%) from 2023
Net Assets
Up$11,218,314
Up $1,445,623 (+15%) from 2023
Revenue
Up$3,988,187
Up $1,103,172 (+38%) from 2023
Expenses
Down$3,262,065
Down $26,157 (-0.8%) from 2023
Net Income
Up$726,122
Up $1,129,329 (+280%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
The mission of the association is promotion of the legacy of maria mitchell and exploration, education and enjoyment of nantucket's land, waters and skies beyond. In fulfilling the mission they recognize the historic persona of maria mitchell, the foremost american woman scientist and educator of the 19th century, and her potential impact on contemporary thought by passing on her legacy of intellectual curiosity, respect for and love of nature, learning by doing, and the ideal of individualism. The association's contributions to astronomy, science, and education are the basis for their continuing tradition of high quality research and teaching which inspires today's learners and tomorrow's scientists. The association also provides scientific resources and educational programs for the community, uses nantucket island as an exceptional natural laboratory in which to study science and the environment, and maintains research and/or representative collections of nantucket's biodiversity.
The nantucket maria mitchell association was formed for the purpose of research and education in astronomy and the natural sciences.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $6,364,634 | $6,748,807 | ▲ $384,173 |
| Investments in Publicly Traded Securities | $2,799,980 | $2,772,806 | ▼ $27,174 |
| Pledges and Grants Receivable | $492,497 | $1,104,918 | ▲ $612,421 |
| Receivables From Officers Etc | $255,000 | $255,000 | → $0 |
| Savings and Temporary Cash Investments | $407,477 | $202,387 | ▼ $205,090 |
| Cash and Non-Interest-Bearing Accounts | $132,843 | $139,992 | ▲ $7,149 |
| Inventories for Sale or Use | $4,600 | $25,231 | ▲ $20,631 |
| Prepaid Expenses and Deferred Charges | $6,861 | $0 | ▼ $6,861 |
| Accounts Receivable | $482 | $1,440 | ▲ $958 |
| Total Assets | $12,568,382 | $14,017,665 | ▲ $1,449,283 |
| Other Assets Total | $2,104,008 | $2,767,084 | ▲ $663,076 |
| Liabilities | |||
| Mortgage Notes Payable Secured by Investment Property | $1,699,786 | $1,677,211 | ▼ $22,575 |
| Accounts Payable and Accrued Expenses | $326,778 | $583,649 | ▲ $256,871 |
| Unsecured Notes Loans Payable | $249,127 | $538,491 | ▲ $289,364 |
| Deferred Revenue | $520,000 | $0 | ▼ $520,000 |
| Total Liabilities | $2,795,691 | $2,799,351 | ▲ $3,660 |
| Net Assets / Fund Balance | |||
| Net Assets With Donor Restrictions | $4,592,671 | $7,446,533 | ▲ $2,853,862 |
| Net Assets Without Donor Restrictions | $5,180,020 | $3,771,781 | ▼ $1,408,239 |
| Total Net Assets Fund Balance | $9,772,691 | $11,218,314 | ▲ $1,445,623 |
| Total Liabilities and Net Assets / Fund Balance | $12,568,382 | $14,017,665 | ▲ $1,449,283 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $2,718,276 | $2,778,814 | $5,497,090 |
| Land | $3,274,280 | - | $3,274,280 |
| Equipment | $222,140 | $675,450 | $897,590 |
| Other Land Buildings | $534,111 | - | $534,111 |
| Other Assets Org | $2,767,084 | - | - |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $2,368,785 | - | ▲ $291,323 | $50,000 | $2,610,108 |
| 2023 | $1,880,517 | $153,579 | ▲ $385,286 | $50,597 | $2,368,785 |
| 2022 | $2,337,337 | $46,039 | ▼ $502,859 | - | $1,880,517 |
| 2021 | $2,054,700 | $47,071 | ▲ $329,631 | $94,065 | $2,337,337 |
| 2020 | $2,535,920 | $39,330 | ▲ $355,335 | $875,885 | $2,054,700 |
| Name | Title | Base | Other | Total |
|---|---|---|---|---|
| Joanna Roche | Executive Director | $174,975 | $72,440 | $247,415 |
| Jascin Leonardo Finger | Deputy Director | $103,615 | $4,078 | $107,693 |
| Kathrine Robinson Grieder | Finance Director | $91,337 | $15,512 | $106,849 |
| Name | Title |
|---|---|
| Helene Weld | President |
| John Wise | First Vice President |
| Curt Burwell | Second Vice President |
| Brian Sullivan | Director |
| Christopher Griffiths | Director |
| Elizabeth Markel | Director |
| March Archibald Poor | Director |
| Margaret Falk | Director |
| Molly Paiement | Director |
| Richard Bard | Director |
| Richard Wolfe | Director |
| Tanya Forman | Director |
| Toni Mckerrow | Director |
| Joseph Santucci | Clerk |
| Karen Ketterer | Treasurer |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $1,586,754 |
| Other Expenses | $1,530,445 |
| Total Fundraising Expense | $775,031 |
| Professional Fundraising Fees | $144,866 |
| Grants and Similar Amounts Paid | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $761,114 | $199,068 | $180,663 | $1,140,845 |
| Fees for Services Other | $73,509 | $50,179 | $161,491 | $285,179 |
| Depreciation Depletion | $205,889 | $24,222 | $12,111 | $242,222 |
| Current Officers, Directors, Trustees, and Key Employees | $75,275 | $43,402 | $77,960 | $196,637 |
| Insurance | $134,627 | $21,118 | $7,919 | $163,664 |
| Occupancy | $88,392 | $65,783 | $4,385 | $158,560 |
| Fees for Services Professional Fundraising | - | - | $144,866 | $144,866 |
| Other Employee Benefits | $63,892 | $49,330 | $19,154 | $132,376 |
| Payroll Taxes | $71,491 | $28,486 | $16,919 | $116,896 |
| Advertising | $2,562 | $2,043 | $95,635 | $100,240 |
| Interest | - | $67,711 | - | $67,711 |
| All Other Expenses | $31,373 | $25,751 | $9,839 | $66,963 |
| Travel | $29,936 | $30,219 | $1,985 | $62,140 |
| Other Expenses | $30,165 | $13,431 | $1,774 | $45,370 |
| Fees for Services Legal | - | $43,300 | - | $43,300 |
| Fees for Service Investment Mgmnt Fees | - | $30,000 | - | $30,000 |
| Fees for Services Accounting | - | $17,000 | - | $17,000 |
| Total Functional Expenses | $1,704,814 | $782,220 | $775,031 | $3,262,065 |
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $3,262,065 |
| Total Expenses per Audited Statements | $3,254,934 |
| Expenses per Audited Statements | $3,232,065 |
| Expenses Not Reported on Financial Statements | $30,000 |
| Other Expense Adjustments | $30,000 |
| Expenses Not Reported on Form 990 | $22,869 |
| Line Item | Amount |
|---|---|
| Fundraising Direct Expenses | $232,655 |
| Fundraising Gross Income | $232,655 |
| Professional Fundraising Fees | $144,866 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Summer Gala Event and Dinner | $883,290 | $232,655 | $17,904 | $214,751 |
| Total Events | $883,290 | $232,655 | $232,655 | $0 |
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Receivables from Officers, Directors, Trustees, and Key Employees | $255,000 | $255,000 | → $0 |
“The form 990 will be formally reviewed and approved by the finance committee prior to filing. The finance committee will report to the full board of directors in a timely fashion. The form 990 will be made available to the entire board of directors prior to being filed.”
“The association regulates and consistently monitors & enforces policy compliance through staff meetings, monthly budget reviews with department heads and periodic reviews by mma.”
“Compensation is determined by the board of directors based on information provided by a professional search firm.”
“Requests for access are directed to the executive director who, in turn, provides the return and requested information.”
“Accretion of remainder interest in real estate 663,676. Bad debt -57,000. Capital purchases -133,435.”
“As allowed by accounting principles generally accepted in the united states of america and following the practices of many museums, the association has not capitalized its collection of items of historical nature and other related objects purchased or donated. The collection is held for public exhibition, education, or research in furtherance of public service rather than financial gain. The association continually reviews its collection and may deaccess or acquire additional items. Expenditures for additional collection items are presented as a reduction in the appropriate class of net assets. Proceeds from deaccessions are reflected as increases in unrestricted net assets.”
“The association owns and operates two observatories, an aquarium, a natural science museum, an historic house, and archives and special collections in their research library. Their properties serve as active research centers, housing for scientific collections, and forums for public education programs.”
“The association's endowment consists of individual donor restricted funds established for a variety of purposes. Its endowment includes both donor restricted endowment funds and funds designated by the association to function as endowments. As required by generally accepted accounting principles, net assets associated with endowment funds are classified and reported based on the existence or absence of donor-imposed or legal restrictions. As required by generally accepted accounting principles, the association classifies as donor restricted net assets (a) the original value of gifts donated to the permanent endowment, (b) the original value of subsequent gifts to the permanent endowment, and (c) accumulations to the permanent endowment made in accordance with the direction of the applicable donor gift instrument at the time the accumulation is added to the fund. The remaining portion of the donor-restricted endowment fund that is not classified in permanently restricted net assets is classified as temporarily restricted net assets until those amounts are appropriated for expenditure by the association in a manner consistent with the standard of prudence prescribed by state law. In accordance with the uniform prudent management of institutional funds act, the association may consider the following factors in making a determination to appropriate or accumulate donor-restricted endowment funds: the duration and preservation of the fund; the purposes of the association and the donor-restricted endowment fund; general economic conditions; the possible effect of inflation and deflation; the expected total return from income and the appreciation of investments; other resources of the association; and the investment policies of the association. The association has adopted investment and spending policies for its board-designated and other endowment assets that attempt to provide a predictable stream of funding for its programs while seeking to maintain the purchasing power of the endowment assets. Under this policy, as approved by the board, the endowment assets are invested in a portfolio of debt and equity securities with the objective of achieving long-term capital appreciation while moderating the level of investment risk. Actual returns in any given year may vary from this amount. To satisfy its long-term rate-of-return objectives, the association relies on a total return strategy in which investment returns are achieved through both capital appreciation (realized and unrealized) and current yield (interest, dividends and net rental income). The association has invested in mutual funds that target a diversified asset allocation that places a greater emphasis on equity-based investments to achieve its long-term return objectives within prudent risk constraints. The association has a policy of appropriating for distribution each year an amount based on budgeted expenses supported by the fund. In establishing this policy, the association considered the long-term expected return on its endowment. This is consistent with the association's objective to maintain the purchasing power of its endowment. From time to time, the fair value of assets associated with individual donor-restricted endowment funds may fall below the level that the donor imposed restrictions require the association to retain as a fund of perpetual duration. There were no such deficiencies as of december 31, 2023.”
“Resale of items 22,869. Accretion of remainder interest in real estate 663,676. Investment fees -30,000.”
“Materials for resale 22,869.”
“INVESTMENT FEES 30,000.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
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| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 326778 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 583649 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 482 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 1440 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | THE NANTUCKET MARIA MITCHELL ASSOCIATION WAS FORMED FOR THE PURPOSE OF RESEARCH AND EDUCATION IN ASTRONOMY AND THE NATURAL SCIENCES. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 95635 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 2043 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 2562 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 100240 |
| IRS990/AllOtherContributionsAmt | 0 | 1943987 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 9839 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 25751 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 31373 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 66963 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | KATHARINE ROBINSON GRIEDER |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 5082289198 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 4 VESTAL STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | NANTUCKET |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02554 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 132843 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 139992 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 1 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 77960 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 43402 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 75275 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 196637 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContriRptFundraisingEventAmt | 0 | 650635 |
| IRS990/CostOfGoodsSoldAmt | 0 | 22869 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 2714390 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 168428 |
| IRS990/CYOtherExpensesAmt | 0 | 1530445 |
| IRS990/CYOtherRevenueAmt | 0 | 617272 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 488097 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 726122 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1586754 |
| IRS990/CYTotalExpensesAmt | 0 | 3262065 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 775031 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 144866 |
| IRS990/CYTotalRevenueAmt | 0 | 3988187 |
| IRS990/DAFExcessBusinessHoldingsInd | 0 | 0 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 1 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 520000 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 12111 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 24222 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 205889 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 242222 |
| IRS990/Desc | 0 | THE ASSOCATION CONDUCTS PROGRAMS OF RESEARCH AND EDUCATION IN ASTRONOMY AND THE NATURAL SCIENCES. FOR THESE PURPOSES IT MAINTAINS TWO OBSERVATORIES, A LIBRARY, AN AQUARIUM & EXHIBIT AND THE MARIA MITCHELL BIRTHPLACE MUSEUM. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DistributionToDonorInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 4592671 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 7446533 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 67 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 1704814 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 17000 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 17000 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 43300 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 43300 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 161491 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 50179 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 73509 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 285179 |
| IRS990/FeesForServicesProfFundraising/FundraisingAmt | 0 | 144866 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 144866 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 30000 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 30000 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form1098CFiledInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form8899Filedind | 0 | 0 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 1.00 |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 20514 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 15512 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 4078 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | HELENE WELD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | JOHN WISE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | CURT BURWELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | KAREN KETTERER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | JOSEPH SANTUCCI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | RICHARD BARD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | MARGARET FALK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | TANYA FORMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | ELIZABETH MARKEL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | CHRISTOPHER GRIFFITHS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | TONI MCKERROW |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | MOLLY PAIEMENT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | MARCH ARCHIBALD POOR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | BRIAN SULLIVAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | RICHARD WOLFE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | JOANNA ROCHE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | KATHRINE ROBINSON GRIEDER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | JASCIN LEONARDO FINGER |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 226901 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 91337 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 103615 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | FIRST VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | SECOND VICE PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | CLERK |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | EXECUTIVE DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | FINANCE DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | DEPUTY DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1903 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedInd | 0 | 0 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 650635 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 232655 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 232655 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | -1253 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 15 |
| IRS990/GovernmentGrantsAmt | 0 | 18621 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 402147 |
| IRS990/GrossReceiptsAmt | 0 | 4647111 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 75957 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 44184 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 15 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 7919 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 21118 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 134627 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 163664 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 67711 |
| IRS990/InterestGrp/TotalAmt | 0 | 67711 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 4600 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 25231 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 169681 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 169681 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 2799980 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 2772806 |
| IRS990/IRPDocumentCnt | 0 | 18 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 3454264 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 6364634 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 6748807 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 10203071 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 403400 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 0 |
| IRS990/LoanOutstandingInd | 0 | 1 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembershipDuesAmt | 0 | 101147 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | THE MISSION OF THE ASSOCIATION IS PROMOTION OF THE LEGACY OF MARIA MITCHELL AND EXPLORATION, EDUCATION AND ENJOYMENT OF NANTUCKET'S LAND, WATERS AND SKIES BEYOND. IN FULFILLING THE MISSION THEY RECOGNIZE THE HISTORIC PERSONA OF MARIA MITCHELL, THE FOREMOST AMERICAN WOMAN SCIENTIST AND EDUCATOR OF THE 19TH CENTURY, AND HER POTENTIAL IMPACT ON CONTEMPORARY THOUGHT BY PASSING ON HER LEGACY OF INTELLECTUAL CURIOSITY, RESPECT FOR AND LOVE OF NATURE, LEARNING BY DOING, AND THE IDEAL OF INDIVIDUALISM. THE ASSOCIATION'S CONTRIBUTIONS TO ASTRONOMY, SCIENCE, AND EDUCATION ARE THE BASIS FOR THEIR CONTINUING TRADITION OF HIGH QUALITY RESEARCH AND TEACHING WHICH INSPIRES TODAY'S LEARNERS AND TOMORROW'S SCIENTISTS. THE ASSOCIATION ALSO PROVIDES SCIENTIFIC RESOURCES AND EDUCATIONAL PROGRAMS FOR THE COMMUNITY, USES NANTUCKET ISLAND AS AN EXCEPTIONAL NATURAL LABORATORY IN WHICH TO STUDY SCIENCE AND THE ENVIRONMENT, AND MAINTAINS RESEARCH AND/OR REPRESENTATIVE COLLECTIONS OF NANTUCKET'S BIODIVERSITY. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 1699786 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 1677211 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 9772691 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 11218314 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | -1253 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | -1253 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/RelatedOrExemptFuncIncomeAmt | 0 | 21315 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 21315 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 75957 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 75957 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 246260 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 5180020 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 3771781 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 4385 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 65783 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 88392 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 158560 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 2104008 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 2767084 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 473241 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 19154 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 49330 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 63892 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 132376 |
| IRS990/OtherExpensesGrp/Desc | 0 | SMALL EQUIPMENT |
| IRS990/OtherExpensesGrp/Desc | 1 | MISCELLANEOUS |
| IRS990/OtherExpensesGrp/Desc | 2 | BANK AND CREDIT CARD RE |
| IRS990/OtherExpensesGrp/Desc | 3 | TELEPHONE & INTERNET |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 18547 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 21783 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 1774 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 8444 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 54727 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 8006 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 3 | 13431 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 100594 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 17411 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 18584 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 30165 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 127585 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 72138 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 48373 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 45370 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | MITIGATION PAYMENT |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 520000 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 520000 |
| IRS990/OtherRevenueTotalAmt | 0 | 520000 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 180663 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 199068 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 761114 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 1140845 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 16919 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 28486 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 71491 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 116896 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 492497 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 1104918 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 6861 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 0 |
| IRS990/PrincipalOfficerNm | 0 | CURT BURWELL |
| IRS990/ProfessionalFundraisingInd | 0 | 1 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 611600 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | CLASSES/LECTURES/ADMI |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 488097 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 488097 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 2382117 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 74291 |
| IRS990/PYOtherExpensesAmt | 0 | 1487941 |
| IRS990/PYOtherRevenueAmt | 0 | -23929 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 452536 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -403207 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1632363 |
| IRS990/PYTotalExpensesAmt | 0 | 3288222 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 167918 |
| IRS990/PYTotalRevenueAmt | 0 | 2885015 |
| IRS990/QuidProQuoContributionsInd | 0 | 1 |
| IRS990/QuidProQuoContriDisclInd | 0 | 1 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReceivablesFromOfficersEtcGrp/BOYAmt | 0 | 255000 |
| IRS990/ReceivablesFromOfficersEtcGrp/EOYAmt | 0 | 255000 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 726122 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 75957 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 1 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
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