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        <EndYearBalanceAmt>9364995</EndYearBalanceAmt>
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        <ContributionsAmt>23390</ContributionsAmt>
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        <OtherExpendituresAmt>176674</OtherExpendituresAmt>
        <EndYearBalanceAmt>8386912</EndYearBalanceAmt>
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        <EndYearBalanceAmt>7908506</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>1.00000</BoardDesignatedBalanceEOYPct>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedFinclStmtAmt>40191</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>The endowment income will be spent to support resource conservation, education, health, culture, and public facilities for Squirrel Island, Maine.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Foundation has received a determination letter from the Internal Revenue Service stating that it qualifies for tax-exempt status under Section 501(c)(3) of the Internal Revenue Code (the Code) and for Public Charity status under Section 509(a)(3) of the Code. Tax-exempt organizations could be required to record an obligation for income taxes as the result of a tax position they have historically taken on various tax exposure items including unrelated business income or tax status. Under guidance issued by the Financing Accounting Standards Board, assets and liabilities are established for uncertain tax positions taken or positions expected to be taken in income tax returns when such positions are judged to not meet the "more-likely-than-not" threshold, based upon the technical merits of the position. The Foundation has evaluated the positions taken on its filed tax returns. The Foundation has concluded that no uncertain income tax positions exist at December 31, 2023.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 4b - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Accrual to cash conversion 142.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>One board member (overseer trustee) of Squirrel Island Preservation Foundation shall be elected by and from the board of overseers of Squirrel Island Village Corporation. There shall be five board members-at-large elected by the legal voters of Squirrel Island Village Corporation. There shall also be one association trustee elected by the board of Squirrel Island Association, an affiliated organization that is not related by Form 990 qualifications.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The board of directors is provided a copy of the Form 990. It is also carefully reviewed by an authorized person from the board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>All documents are available at annual meetings and upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, line 2c:</FormAndLineReferenceDesc>
        <ExplanationTxt>The oversight process and selection process of an independent auditor are unchanged.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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          <AddressLine1Txt>Southport Island</AddressLine1Txt>
          <CityNm>Boothbay Harbor</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04538</ZIPCd>
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        <PrimaryActivitiesTxt>Governance</PrimaryActivitiesTxt>
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