Liabilities / Assets
28th percentile
Higher debt load relative to assets than 28% of similar nonprofits.
EIN 11-6083115 • 501(c)3 • Shelter Island, NY
Profile
The mission of the shelter island historical society is to research, preserve and share our heritage and island history through education, exhibition, scholarship and community activities. We interpret shelter island's past and on going life through preservation of historical material from the first inhabitants, shelters and town fathers, to those who have made it a caring and unique community through the years. We strive to preserve the island's heritage for future generations.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
28th percentile
Higher debt load relative to assets than 28% of similar nonprofits.
Liabilities / Revenue
42nd percentile
Higher debt load relative to revenue than 42% of similar nonprofits.
Net Margin
11th percentile
Higher net margin than 11% of similar nonprofits.
Top Officer Pay
40th percentile
Higher top officer pay than 40% of similar nonprofits.
Top officer pay equals 0.0% of source-year revenue.
Asset Growth
28th percentile
Faster asset growth than 28% of similar nonprofits.
Revenue Growth
75th percentile
Faster revenue growth than 75% of similar nonprofits.
Assets
Down$4,936,716
Down $169,740 (-3.3%) from 2023
Liabilities
Down$24,317
Down $7,936 (-25%) from 2023
Net Assets
Down$4,912,399
Down $161,804 (-3.2%) from 2023
Revenue
Up$567,774
Up $135,041 (+31%) from 2023
Expenses
Up$729,578
Up $76,621 (+12%) from 2023
Net Income
Up-$161,804
Up $58,420 (+27%) from 2023
Most recent year
2024 • Form 990XML pending. An XML filing is linked for this year, but detailed extraction is still pending.
The latest 2024 filing currently has linked XML that has not been fully parsed yet. Showing the latest detailed filing from 2023 below.
The mission of the shelter island historical society is to research, preserve and share our heritage and island history through education, exhibition, scholarship and community activities. We interpret shelter island's past and on going life through preservation of historical material from the first inhabitants, shelters and town fathers, to those who have made it a caring and unique community through the years. We strive to preserve the island's heritage for future generations.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $4,864,510 | $4,725,906 | ▼ $138,604 |
| Cash and Non-Interest-Bearing Accounts | $252,785 | $248,387 | ▼ $4,398 |
| Investments in Publicly Traded Securities | $135,820 | $86,388 | ▼ $49,432 |
| Inventories for Sale or Use | $633 | $42,985 | ▲ $42,352 |
| Savings and Temporary Cash Investments | $1,707 | $2,247 | ▲ $540 |
| Prepaid Expenses and Deferred Charges | $502 | $543 | ▲ $41 |
| Total Assets | $5,255,957 | $5,106,456 | ▼ $149,501 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $14,327 | $27,056 | ▲ $12,729 |
| Other Liabilities | $5,726 | $5,197 | ▼ $529 |
| Total Liabilities | $20,053 | $32,253 | ▲ $12,200 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $5,051,045 | $4,903,944 | ▼ $147,101 |
| Net Assets With Donor Restrictions | $184,859 | $170,259 | ▼ $14,600 |
| Total Net Assets Fund Balance | $5,235,904 | $5,074,203 | ▼ $161,701 |
| Total Liabilities and Net Assets / Fund Balance | $5,255,957 | $5,106,456 | ▼ $149,501 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Leasehold Improvements | $4,717,096 | $640,270 | $5,357,366 |
| Buildings | $3,870 | $172,458 | $176,328 |
| Equipment | $2,440 | $12,264 | $14,704 |
| Land | $2,500 | - | $2,500 |
| Name | Title |
|---|---|
| Mary Fran Gleason | President |
| Amy Cococcia | Trustee |
| Jeff Feingold | Trustee |
| Jim Gereghty | Trustee |
| Maggie Murphy | Trustee |
| Penny Rudder | Trustee |
| Elizabeth Nardin | Secretary |
| PEG D'ORIO | Treasurer |
| Adam Bundy | Vice Preside |
| Chris Carey | Vice Preside |
| Line Item | Amount |
|---|---|
| Other Expenses | $375,787 |
| Salaries, Compensation, and Employee Benefits | $277,170 |
| Total Fundraising Expense | $80,662 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $177,047 | $26,588 | $49,377 | $253,012 |
| Depreciation Depletion | $138,604 | - | - | $138,604 |
| All Other Expenses | $22,477 | $8,204 | - | $30,681 |
| Insurance | $25,009 | $4,413 | - | $29,422 |
| Payroll Taxes | $24,158 | - | - | $24,158 |
| Office Expenses | $291 | $11,338 | $8,245 | $19,874 |
| Occupancy | $11,699 | - | - | $11,699 |
| Other Expenses | $9,828 | $1,734 | $19,620 | $11,562 |
| Fees for Services Accounting | - | $6,000 | - | $6,000 |
| Advertising | - | - | $3,420 | $3,420 |
| Fees for Services Other | - | $3,370 | - | $3,370 |
| Total Functional Expenses | $510,648 | $61,647 | $80,662 | $652,957 |
| Line Item | Amount |
|---|---|
| Expenses per Audited Statements | $652,957 |
| Total Expenses per Audited Statements | $652,957 |
| Total Expenses per Form 990 | $652,957 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Liability | Amount |
|---|---|
| Taxes Payable | $5,197 |
“Form 990 reviewed with finance committee prior to submission to the entire board”
“Board of trustees will review annual conflict of interest disclosures to determine if a conflict exists”
“Executive director salary is reviewed and determined by the finance committee and board using comparable data and contemporaneous substantiation of the decision”
“All compensation reviewed by the finance committee, then presented to the board at large for approval.”
“Organization will provide governing documents upon request”
“The mission of the shelter island historical society is to research, preserve and share our heritage and island history through education, exhibition, scholarship and community activities. We interpret shelter island's past and on going life through preservation of historical material from the first inhabitants, shelters and town fathers, to those who have made it a caring and unique community through the years. We strive to preserve the island's heritage for future generations.”
“Prior period adjustment 47,020”
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 | true |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 14327 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 27056 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | THE MISSION OF THE SHELTER ISLAND HISTORICAL SOCIETY IS TO RESEARCH, PRESERVE AND SHARE OUR HERITAGE AND ISLAND HISTORY THROUGH EDUCATION, EXHIBITION, SCHOLARSHIP AND COMMUNITY ACTIVITIES. WE INTERPRET SHELTER ISLAND'S PAST AND ON GOING LIFE THROUGH PRESERVATION OF HISTORICAL MATERIAL FROM THE FIRST INHABITANTS, SHELTERS AND TOWN FATHERS, TO THOSE WHO HAVE MADE IT A CARING AND UNIQUE COMMUNITY THROUGH THE YEARS. WE STRIVE TO PRESERVE THE ISLAND'S HERITAGE FOR FUTURE GENERATIONS. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 3420 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 3420 |
| IRS990/AllOtherContributionsAmt | 0 | 247174 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 8204 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 22477 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 30681 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | NANETTE LAWRENSON |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6317490025 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | PO BOX 847 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | SHELTER ISLAND |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | NY |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 11964 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 252785 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 248387 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 247174 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 8847 |
| IRS990/CYOtherExpensesAmt | 0 | 375787 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 176712 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -220224 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 277170 |
| IRS990/CYTotalExpensesAmt | 0 | 652957 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 80662 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 432733 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 138604 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 138604 |
| IRS990/Desc | 0 | EDUCATIONAL PROGRAMS AND EVENTS INCLUDING ONGOING CATALOGING, RESTORATION TO HISTORIC BUILDINGS, NEW EDUCATIONS PROGRAMS, TECHNOLOGY UPGRADE AND INTERN PROGRAM. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 184859 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 170259 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | true |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 13 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 510648 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 6000 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 6000 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 3370 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 3370 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form1098CFiledInd | 0 | false |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form8899Filedind | 0 | false |
| 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/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/PersonNm | 0 | CHRIS CAREY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | JIM GEREGHTY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | PEG D'ORIO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | PENNY RUDDER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | ADAM BUNDY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | MARY FRAN GLEASON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | MAGGIE MURPHY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | JEFF FEINGOLD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | AMY COCOCCIA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | ELIZABETH NARDIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | PENNY RUDDER |
| 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/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/TitleTxt | 0 | VICE PRESIDE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | VICE PRESIDE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TRUSTEE |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1966 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedInd | 0 | false |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 6509 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 12 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 77610 |
| IRS990/GrossReceiptsAmt | 0 | 503834 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | false |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 12 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 4413 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 25009 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 29422 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 633 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 42985 |
| IRS990/InvestmentIncomeGrp/RelatedOrExemptFuncIncomeAmt | 0 | 2338 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 2338 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 135820 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 86388 |
| IRS990/IRPDocumentCnt | 0 | 8 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 824992 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 4864510 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 4725906 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 5550898 |
| IRS990/LegalDomicileStateCd | 0 | NY |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 71101 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | THE MISSION OF THE SHELTER ISLAND HISTORICAL SOCIETY IS TO RESEARCH, PRESERVE AND SHARE OUR HERITAGE AND ISLAND HISTORY THROUGH EDUCATION, EXHIBITION, SCHOLARSHIP AND COMMUNITY ACTIVITIES. WE INTERPRET SHELTER ISLAND'S PAST AND ON GOING LIFE THROUGH PRESERVATION OF HISTORICAL MATERIAL FROM THE FIRST INHABITANTS, SHELTERS AND TOWN FATHERS, TO THOSE WHO HAVE MADE IT A CARING AND UNIQUE COMMUNITY THROUGH THE YEARS. WE STRIVE TO PRESERVE THE ISLAND'S HERITAGE FOR FUTURE GENERATIONS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 5235904 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 5074203 |
| IRS990/NetGainOrLossInvestmentsGrp/RelatedOrExemptFuncIncomeAmt | 0 | 6509 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 6509 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 11503 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 5051045 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 4903944 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 11699 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 11699 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 8245 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 11338 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 291 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 19874 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 47020 |
| IRS990/OtherExpensesGrp/Desc | 0 | COGS |
| IRS990/OtherExpensesGrp/Desc | 1 | REPAIRS AND MAINTENANCE |
| IRS990/OtherExpensesGrp/Desc | 2 | EVENTS |
| IRS990/OtherExpensesGrp/Desc | 3 | SOFTWARE |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 19620 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 1734 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 70560 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 30975 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 9828 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 70560 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 30975 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 19620 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 11562 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 5726 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 5197 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 49377 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 26588 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 177047 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 253012 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 24158 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 24158 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 502 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 543 |
| IRS990/PrincipalOfficerNm | 0 | NANETTE LAWRENSON |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | PROGRAMS |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | SPECIAL EVENTS |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | MERCHANDISE |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 74929 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 65975 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 35808 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 74929 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 65975 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 35808 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 249930 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | -4159 |
| IRS990/PYOtherExpensesAmt | 0 | 507335 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 162691 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -324793 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 225920 |
| IRS990/PYTotalExpensesAmt | 0 | 733255 |
| IRS990/PYTotalRevenueAmt | 0 | 408462 |
| IRS990/QuidProQuoContributionsInd | 0 | true |
| IRS990/QuidProQuoContriDisclInd | 0 | true |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | false |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -220224 |
| 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 | true |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 180791 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 1707 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 2247 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearAmt | 0 | 10000 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus1YearAmt | 0 | 10000 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus3YearsAmt | 0 | 229552 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus4YearsAmt | 0 | 1285432 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/TotalAmt | 0 | 1534984 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt | 0 | PEDERSEN, BILL - 2020 0 PEDERSEN, BILL - 2019 0 PEDERSEN, BILL - 2018 0 PEDERSEN, BILL - 2017 0 |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc | 0 | SUPPORTING SCHEDULE |
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| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus1YearAmt | 0 | 249930 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 360271 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 670605 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 1501723 |
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| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 3673 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 4709 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 4550 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 7196 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/TotalAmt | 0 | 22466 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearAmt | 0 | 179050 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus1YearAmt | 0 | 166364 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus2YearsAmt | 0 | 132157 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus3YearsAmt | 0 | 42254 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus4YearsAmt | 0 | 150507 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/TotalAmt | 0 | 670332 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearAmt | 0 | 2338 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 3673 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 4709 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 4550 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 7196 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/TotalAmt | 0 | 22466 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0.01000 |
| IRS990ScheduleA/InvestmentIncomePYPct | 0 | 0.01000 |
| IRS990ScheduleA/PubliclySupportedOrg509a2Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY509Pct | 0 | 0.58160 |
| IRS990ScheduleA/PublicSupportPY509Pct | 0 | 0.44020 |
| IRS990ScheduleA/PublicSupportTotal509Amt | 0 | 2165051 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearAmt | 0 | 10000 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus1YearAmt | 0 | 10000 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus3YearsAmt | 0 | 229552 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus4YearsAmt | 0 | 1285432 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/TotalAmt | 0 | 1534984 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY509Ind | 0 | X |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearAmt | 0 | 426224 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus1YearAmt | 0 | 416294 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 492428 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 712859 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 1652230 |
| IRS990ScheduleA/Total509Grp/TotalAmt | 0 | 3700035 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearAmt | 0 | 428562 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus1YearAmt | 0 | 419967 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus2YearsAmt | 0 | 497137 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus3YearsAmt | 0 | 717409 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus4YearsAmt | 0 | 1659426 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/TotalAmt | 0 | 3722501 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | true |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 3870 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 172458 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 176328 |
| IRS990ScheduleD/EndowmentsHeldRelatedOrgInd | 0 | false |
| IRS990ScheduleD/EndowmentsHeldUnrelatedOrgInd | 0 | false |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 2440 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 12264 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 14704 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 652957 |
| IRS990ScheduleD/LandGrp/BookValueAmt | 0 | 2500 |
| IRS990ScheduleD/LandGrp/OtherCostOrOtherBasisAmt | 0 | 2500 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/BookValueAmt | 0 | 4717096 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/DepreciationAmt | 0 | 640270 |
| IRS990ScheduleD/LeaseholdImprovementsGrp/OtherCostOrOtherBasisAmt | 0 | 5357366 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 5197 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | TAXES PAYABLE |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 432733 |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 4725906 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 652957 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 5197 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 432733 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 432733 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 652957 |
| IRS990/ScheduleJRequiredInd | 0 | false |
| IRS990/ScheduleORequiredInd | 0 | true |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | THE MISSION OF THE SHELTER ISLAND HISTORICAL SOCIETY IS TO RESEARCH, PRESERVE AND SHARE OUR HERITAGE AND ISLAND HISTORY THROUGH EDUCATION, EXHIBITION, SCHOLARSHIP AND COMMUNITY ACTIVITIES. WE INTERPRET SHELTER ISLAND'S PAST AND ON GOING LIFE THROUGH PRESERVATION OF HISTORICAL MATERIAL FROM THE FIRST INHABITANTS, SHELTERS AND TOWN FATHERS, TO THOSE WHO HAVE MADE IT A CARING AND UNIQUE COMMUNITY THROUGH THE YEARS. WE STRIVE TO PRESERVE THE ISLAND'S HERITAGE FOR FUTURE GENERATIONS. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | FORM 990 REVIEWED WITH FINANCE COMMITTEE PRIOR TO SUBMISSION TO THE ENTIRE BOARD |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | BOARD OF TRUSTEES WILL REVIEW ANNUAL CONFLICT OF INTEREST DISCLOSURES TO DETERMINE IF A CONFLICT EXISTS |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | EXECUTIVE DIRECTOR SALARY IS REVIEWED AND DETERMINED BY THE FINANCE COMMITTEE AND BOARD USING COMPARABLE DATA AND CONTEMPORANEOUS SUBSTANTIATION OF THE DECISION |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 4 | ALL COMPENSATION REVIEWED BY THE FINANCE COMMITTEE, THEN PRESENTED TO THE BOARD AT LARGE FOR APPROVAL. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 5 | ORGANIZATION WILL PROVIDE GOVERNING DOCUMENTS UPON REQUEST |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 6 | PRIOR PERIOD ADJUSTMENT 47,020 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | FORM 990 - ORGANIZATION'S MISSION |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | FORM 990, PAGE 6, PART VI, LINE 11B |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | FORM 990, PAGE 6, PART VI, LINE 12C |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | FORM 990, PAGE 6, PART VI, LINE 15A |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 4 | FORM 990, PAGE 6, PART VI, LINE 15B |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 5 | FORM 990, PAGE 6, PART VI, LINE 19 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 6 | FORM 990, PART XI, LINE 9 |
| IRS990/SchoolOperatingInd | 0 | false |
| IRS990/SignificantChangeInd | 0 | false |
| IRS990/SignificantNewProgramSrvcInd | 0 | false |
| IRS990/StatesWhereCopyOfReturnIsFldCd | 0 | NY |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | false |
| IRS990/SubjectToProxyTaxInd | 0 | false |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | false |
| IRS990/TaxablePartyNotificationInd | 0 | false |
| IRS990/TaxExemptBondsInd | 0 | false |
| IRS990/TerminateOperationsInd | 0 | false |
| IRS990/TotalAssetsBOYAmt | 0 | 5255957 |
| IRS990/TotalAssetsEOYAmt | 0 | 5106456 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 5255957 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 5106456 |
| IRS990/TotalCompGreaterThan150KInd | 0 | false |
| IRS990/TotalContributionsAmt | 0 | 247174 |
| IRS990/TotalEmployeeCnt | 0 | 13 |
| IRS990/TotalFunctionalExpensesGrp/FundraisingAmt | 0 | 80662 |
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