Liabilities / Assets
24th percentile
Higher debt load relative to assets than 24% of similar nonprofits.
EIN 23-7013467 • 501(c)3 • Newburyport, MA
Profile
To protect, preserve and interpret
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
24th percentile
Higher debt load relative to assets than 24% of similar nonprofits.
Liabilities / Revenue
28th percentile
Higher debt load relative to revenue than 28% of similar nonprofits.
Net Margin
85th percentile
Higher net margin than 85% of similar nonprofits.
Top Officer Pay
63rd percentile
Higher top officer pay than 63% of similar nonprofits.
Top officer pay equals 12.2% of source-year revenue.
Asset Growth
73rd percentile
Faster asset growth than 73% of similar nonprofits.
Revenue Growth
92nd percentile
Faster revenue growth than 92% of similar nonprofits.
Assets
Up$2,598,675
Up $326,186 (+14%) from 2023
Liabilities
Up$5,163
Up $367 (+7.7%) from 2023
Net Assets
Up$2,593,512
Up $325,819 (+14%) from 2023
Revenue
Up$738,431
Up $391,384 (+113%) from 2023
Expenses
Down$452,904
Down $6,253 (-1.4%) from 2023
Net Income
Up$285,527
Up $397,637 (+355%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
To protect, preserve and interpret the martime heritage of the lower Merrimack Valley region and how it relates to American History
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $1,467,757 | $1,610,519 | ▲ $142,762 |
| Investments in Publicly Traded Securities | $522,219 | $589,755 | ▲ $67,536 |
| Savings and Temporary Cash Investments | $276,528 | $393,842 | ▲ $117,314 |
| Inventories for Sale or Use | $5,885 | $4,459 | ▼ $1,426 |
| Cash and Non-Interest-Bearing Accounts | $100 | $100 | → $0 |
| Total Assets | $2,272,489 | $2,598,675 | ▲ $326,186 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $4,796 | $5,163 | ▲ $367 |
| Other Liabilities | $0 | $0 | → $0 |
| Total Liabilities | $4,796 | $5,163 | ▲ $367 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $1,998,455 | $2,327,033 | ▲ $328,578 |
| Net Assets With Donor Restrictions | $269,238 | $266,479 | ▼ $2,759 |
| Total Net Assets Fund Balance | $2,267,693 | $2,593,512 | ▲ $325,819 |
| Total Liabilities and Net Assets / Fund Balance | $2,272,489 | $2,598,675 | ▲ $326,186 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $912,519 | $130,572 | $1,043,091 |
| Land | $698,000 | - | $698,000 |
| Equipment | $0 | $77,738 | $77,738 |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $522,219 | $12,000 | ▲ $55,536 | - | $589,755 |
| 2023 | $443,938 | $12,000 | ▲ $66,281 | - | $522,219 |
| 2022 | $540,188 | - | ▼ $96,250 | - | $443,938 |
| 2021 | $341,879 | $101,914 | ▲ $96,395 | - | $540,188 |
| 2020 | $298,257 | - | ▲ $43,622 | - | $341,879 |
| Name | Title | Full / Part Time | Base | Total |
|---|---|---|---|---|
| James Russell | Executive Director | FT | $90,080 | $90,080 |
| Kathleen Britton | Interim Director | FT | $24,967 | $24,967 |
| Name | Title |
|---|---|
| Jack Santos | President |
| Nita Lamborghini | Vice President |
| Ellie Bailey | Director |
| Jonathan Burke | Director |
| Mark Werner | Director |
| Mary Leen | Director |
| Robert Cronin | Director |
| Sharon Spieldenner | Director |
| Susan Finneran | Director |
| Ted Olsson | Director |
| Thom Gould | Director |
| Tim Regan | Director |
| Jennifer Germain | Clerk |
| Charles Tontar | Treasurer |
| Line Item | Amount |
|---|---|
| Other Expenses | $244,452 |
| Salaries, Compensation, and Employee Benefits | $208,452 |
| Total Fundraising Expense | $51,642 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Current Officers, Directors, Trustees, and Key Employees | $70,386 | $23,462 | $23,462 | $117,310 |
| Other Salaries and Wages | $44,967 | $14,989 | $14,989 | $74,945 |
| Depreciation Depletion | $34,752 | $0 | $0 | $34,752 |
| Fees for Services Legal | $0 | $32,950 | $0 | $32,950 |
| Insurance | $17,457 | $5,193 | $2,485 | $25,135 |
| Payroll Taxes | $9,719 | $3,239 | $3,239 | $16,197 |
| Occupancy | $12,770 | $1,596 | $1,596 | $15,962 |
| Fees for Services Accounting | $0 | $12,675 | $0 | $12,675 |
| Office Expenses | $8,779 | $2,310 | $1,092 | $12,181 |
| Advertising | $1,150 | $4,829 | $500 | $6,479 |
| Fees for Service Investment Mgmnt Fees | $0 | $4,491 | $0 | $4,491 |
| Other Expenses | $2,781 | $348 | $348 | $3,477 |
| Fees for Services Other | $1,103 | $368 | $368 | $1,839 |
| All Other Expenses | $366 | $124 | $0 | $490 |
| Total Functional Expenses | $287,174 | $114,088 | $51,642 | $452,904 |
| Line Item | Amount |
|---|---|
| Fundraising Gross Income | $83,960 |
| Fundraising Direct Expenses | $78,180 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Gala | $187,500 | $83,960 | $78,180 | $5,780 |
| None | - | - | - | - |
| Total Events | $187,500 | $83,960 | $78,180 | $5,780 |
| Liability | Amount |
|---|---|
| None | $0 |
“The treasurer presents the Form 990 to the board of directors who review the form before it is filed.”
“Board members are required to disclose all conflicts or potential conflicts as they arise.”
“The review of the executive directors salary was done by a committee of the board of directors. The salary was brought before the full board for deliberation and approval.”
“The organizations governing documents and financial statements are available to the public upon request.”
“Amendments to the Organizations by-laws are subject to the approval of its members or the board of directors.”
“The organization has designated a portion of its endowment for building renovations and improvement costs and the remainder can be utilized for any purpose as determined by the board of directors.”
“The organization has adopted the application of the provisions of FASB ASC 740-10 (formerly FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes). The primary tax positions made by the organization are the existence of Unrelated Business Income Tax and the organizations status as an exempt organization under Section 501 (c) (3) of the Internal Revenue Code. The organization currently evaluates all tax positions, and makes determinations regarding the likelihood of those positions being upheld under review. For the year presented, and as a result of adoption, the organization has not recognized any tax benefits or loss contingencies for uncertain tax positions based on its evaluations. The organizations Forms 990, Return of Organization Exempt from Income Tax, for the years ending December 31, 2024, 2023, 2022, and 2021 are subject to examination by the IRS, generally for 3 years after they are filed.”
“The organization maintains various collections and galleries of maritime art, model clipper ships, displays of famous shipwrecks, the history of the Coast Guard, and more. The collections help the organization in protecting, preserving, and communicating the maritime heritage of the Merrimack Valley and its role in American History.”
“Collection items acquired through purchases and contributions since the Organizations inception are not capitalized. Purchases of collection items are recorded as decreases in net assets without donor restrictions, or net assets with donor restrictions if purchased with donor-restricted assets. Contributions of collection items are not recognized in the Statement of Activities. It is the Organizations policy that proceeds from the sale of collections can utilized for any purpose, unless expressly restricted by a donor. The organization maintains various collections and galleries of maritime art, model clipper ships, displays of famous shipwrecks, the history of the Coast Guard, and more. The collections help the organization in protecting, preserving, and communicating the maritime heritage of the Merrimack Valley and its role in American History.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 4796 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 5163 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | To protect, preserve and interpret the martime heritage of the lower Merrimack Valley region and how it relates to American History |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 500 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 4829 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 1150 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 6479 |
| IRS990/AllOtherContributionsAmt | 0 | 533646 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 124 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 366 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 490 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | The Organization |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 9782258774 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 25 Water Street |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Newburyport |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 01950 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 100 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 100 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CollectionsOfArtInd | 0 | true |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 23462 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 23462 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 70386 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 117310 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | false |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/ContriRptFundraisingEventAmt | 0 | 103540 |
| IRS990/CostOfGoodsSoldAmt | 0 | 10395 |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 662466 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 35643 |
| IRS990/CYOtherExpensesAmt | 0 | 244452 |
| IRS990/CYOtherRevenueAmt | 0 | 8018 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 32304 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 285527 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 208452 |
| IRS990/CYTotalExpensesAmt | 0 | 452904 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 51642 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 738431 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | true |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 34752 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 34752 |
| IRS990/Desc | 0 | Operate the Custom House Maritime Museum, offering a collection of historic maritime artifacts. Provides education, lectures and exhibits on maritime topics. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | false |
| IRS990/DoingBusinessAsName/BusinessNameLine1Txt | 0 | Custom House Maritime Museum |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 269238 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 266479 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | true |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 7 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 287174 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 12675 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 12675 |
| IRS990/FeesForServicesLegalGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 32950 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 32950 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 368 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 368 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 1103 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 1839 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 4491 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 4491 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 40.00 |
| 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 |
| 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/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 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Sharon Spieldenner |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Ellie Bailey |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Nita Lamborghini |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Thom Gould |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Jonathan Burke |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Robert Cronin |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Susan Finneran |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Mary Leen |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Ted Olsson |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Mark Werner |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | Tim Regan |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | Jennifer Germain |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | Charles Tontar |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | Jack Santos |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | James Russell |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | Kathleen Britton |
| 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 | 90080 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 24967 |
| 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/TitleTxt | 0 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Vice President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Director |
| 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 | Clerk |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | President |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | Executive Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | Interim Director |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1968 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedInd | 0 | false |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingAmt | 0 | 103540 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 78180 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 83960 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 11194 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 14 |
| IRS990/GrantAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 66673 |
| IRS990/GrossReceiptsAmt | 0 | 882485 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 12633 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
| IRS990/IndependentVotingMemberCnt | 0 | 14 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 2485 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 5193 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 17457 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 25135 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 5885 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 4459 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 24449 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 24449 |
| IRS990/InvestmentIncomeGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 522219 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 589755 |
| IRS990/IRPDocumentCnt | 0 | 9 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 208310 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1467757 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1610519 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 1818829 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 55479 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembershipDuesAmt | 0 | 25280 |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | To protect, preserve and interpret the martime heritage of the lower Merrimack Valley region and how it relates to American History |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 2267693 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 2593512 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 11194 |
| IRS990/NetGainOrLossInvestmentsGrp/RelatedOrExemptFuncIncomeAmt | 0 | 0 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 11194 |
| IRS990/NetGainOrLossInvestmentsGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 5780 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 5780 |
| IRS990/NetIncmFromFundraisingEvtGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/RelatedOrExemptFuncIncomeAmt | 0 | 2238 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 2238 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 40292 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 1998455 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 2327033 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 1596 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 1596 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 12770 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 15962 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 1092 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 2310 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 8779 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 12181 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherExpensesGrp/Desc | 0 | Program expenses |
| IRS990/OtherExpensesGrp/Desc | 1 | Repairs and Maintenance |
| IRS990/OtherExpensesGrp/Desc | 2 | Miscellaneous |
| IRS990/OtherExpensesGrp/Desc | 3 | Telephone |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 0 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 3563 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 3 | 348 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 407 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 7107 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 3 | 348 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 54056 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 28826 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 62 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 2781 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 54056 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 29233 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 10732 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 3477 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 0 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 14989 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 14989 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 44967 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 74945 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 3239 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 3239 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 9719 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 16197 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrincipalOfficerNm | 0 | Robert Cronin |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 712100 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | Museum program |
| IRS990/ProgramServiceRevenueGrp/ExclusionAmt | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 32304 |
| IRS990/ProgramServiceRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 288412 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | 20261 |
| IRS990/PYOtherExpensesAmt | 0 | 162908 |
| IRS990/PYOtherRevenueAmt | 0 | -1391 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 39765 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -112110 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 294414 |
| IRS990/PYTotalExpensesAmt | 0 | 459157 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 1835 |
| IRS990/PYTotalRevenueAmt | 0 | 347047 |
| IRS990/QuidProQuoContributionsInd | 0 | false |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | false |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 285527 |
| IRS990/RegularMonitoringEnfrcInd | 0 | true |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | false |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 32304 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 276528 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 393842 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearAmt | 0 | 14500 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus1YearAmt | 0 | 12000 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus2YearsAmt | 0 | 12500 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus3YearsAmt | 0 | 21500 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus4YearsAmt | 0 | 15537 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/TotalAmt | 0 | 76037 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearAmt | 0 | 662466 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus1YearAmt | 0 | 288412 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 552900 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 361875 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 216262 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/TotalAmt | 0 | 2081915 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearAmt | 0 | 24449 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 21005 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 11504 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 15591 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 370 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/TotalAmt | 0 | 72919 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearAmt | 0 | 44937 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus1YearAmt | 0 | 50940 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus2YearsAmt | 0 | 42255 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus3YearsAmt | 0 | 49742 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus4YearsAmt | 0 | 12799 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/TotalAmt | 0 | 200673 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearAmt | 0 | 24449 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 21005 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 11504 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 15591 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 370 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/TotalAmt | 0 | 72919 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0.03150 |
| IRS990ScheduleA/InvestmentIncomePYPct | 0 | 0.02620 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearAmt | 0 | 5780 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | -3925 |
| IRS990ScheduleA/OtherIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | -17390 |
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