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| IRS990EZ/BooksInCareOfDetail/PhoneNum | 0 | 2122038079 |
| IRS990EZ/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 80 SULLIVAN ST |
| IRS990EZ/BooksInCareOfDetail/USAddress/CityNm | 0 | BROOKLYN |
| IRS990EZ/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | NY |
| IRS990EZ/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 11231 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/BOYAmt | 0 | 20165 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/EOYAmt | 0 | 10385 |
| IRS990EZ/ChgMadeToOrgnzngDocNotRptInd | 0 | false |
| IRS990EZ/ContributionsGiftsGrantsEtcAmt | 0 | 57340 |
| IRS990EZ/DonorAdvisedFndsInd | 0 | false |
| IRS990EZ/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990EZ/ExcessOrDeficitForYearAmt | 0 | -12081 |
| IRS990EZ/FeesAndOtherPymtToIndCntrctAmt | 0 | 4145 |
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| IRS990EZ/ForeignFinancialAccountInd | 0 | false |
| IRS990EZ/ForeignOfficeInd | 0 | false |
| IRS990EZ/Form1120PolFiledInd | 0 | false |
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| IRS990EZ/Form990TotalAssetsGrp/EOYAmt | 0 | 401231 |
| IRS990EZ/GrantsAndSimilarAmountsPaidAmt | 0 | 25690 |
| IRS990EZ/GrossReceiptsAmt | 0 | 82383 |
| IRS990EZ/InfoInScheduleOPartIIInd | 0 | X |
| IRS990EZ/InfoInScheduleOPartIInd | 0 | X |
| IRS990EZ/InvestmentIncomeAmt | 0 | 25043 |
| IRS990EZ/LandAndBuildingsGrp/BOYAmt | 0 | 0 |
| IRS990EZ/LandAndBuildingsGrp/EOYAmt | 0 | 0 |
| IRS990EZ/LobbyingActivitiesInd | 0 | false |
| IRS990EZ/MadeLoansToFromOfficersInd | 0 | false |
| IRS990EZ/MethodOfAccountingCashInd | 0 | X |
| IRS990EZ/NetAssetsOrFundBalancesBOYAmt | 0 | 315691 |
| IRS990EZ/NetAssetsOrFundBalancesEOYAmt | 0 | 303610 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/BOYAmt | 0 | 315691 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/EOYAmt | 0 | 303610 |
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| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 0 | 10.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 1 | 8.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 2 | 0.50 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 3 | 0.50 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 4 | 0.50 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 4 | 0 |
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| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 4 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 0 | MILES PINCUS |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 1 | ALEXANDER PINCUS |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 2 | COLIN SAVAGE |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 3 | WILLIAM ROWELL |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 4 | THOMAS PARRISH |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 0 | DIRECTOR AND PRESIDENT |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 1 | DIRECTOR VICE PRESIDENT AND SECRET |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 2 | DIRECTOR AND TREASURER |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 3 | DIRECTOR |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 4 | DIRECTOR |
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| IRS990EZ/Organization501c3Ind | 0 | X |
| IRS990EZ/OrganizationDissolvedEtcInd | 0 | false |
| IRS990EZ/OrganizationHadUBIInd | 0 | false |
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| IRS990EZ/OtherAssetsTotalDetail/EOYAmt | 0 | 390846 |
| IRS990EZ/OtherExpensesTotalAmt | 0 | 12507 |
| IRS990EZ/PartVIHghstPdCntrctProfSrvcTxt | 0 | NONE |
| IRS990EZ/PartVIOfCompOfHghstPdEmplTxt | 0 | NONE |
| IRS990EZ/PoliticalCampaignActyInd | 0 | false |
| IRS990EZ/PrimaryExemptPurposeTxt | 0 | PRESERVE MARITIME ARTIFACT AND HISTORY |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 0 | EDUCATING THE PUBLIC ABOUT MARITIME CULTURE AND MARINE ECOLOGY |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 0 | 57340 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 0 | 52122 |
| IRS990EZ/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990EZ/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990EZ/ScheduleBNotRequiredInd | 0 | X |
| IRS990EZ/SchoolOperatingInd | 0 | false |
| IRS990EZ/StatesWhereCopyOfReturnIsFldCd | 0 | NY |
| IRS990EZ/SubjectToProxyTaxInd | 0 | false |
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| IRS990EZ/SumOfTotalLiabilitiesGrp/EOYAmt | 0 | 97621 |
| IRS990EZ/TanningServicesProvidedInd | 0 | false |
| IRS990EZ/TotalExpensesAmt | 0 | 94464 |
| IRS990EZ/TotalProgramServiceExpensesAmt | 0 | 52122 |
| IRS990EZ/TotalRevenueAmt | 0 | 82383 |
| IRS990EZ/TransactionWithControlEntInd | 0 | false |
| IRS990EZ/TrnsfrExmptNonChrtblRltdOrgInd | 0 | false |
| IRS990EZ/TypeOfOrganizationCorpInd | 0 | X |
| IRS990EZ/WebsiteAddressTxt | 0 | WWW.MARITIME.FOUNDATION |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/CurrentTaxYearMinus4YearsAmt | 0 | 7840 |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/TotalAmt | 0 | 7840 |
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| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus1YearAmt | 0 | 13574 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 21902 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 28538 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 28933 |
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| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 35048 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 37549 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 30089 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/TotalAmt | 0 | 152750 |
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| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 35048 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 37549 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 30089 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/TotalAmt | 0 | 152750 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0.50000 |
| IRS990ScheduleA/InvestmentIncomePYPct | 0 | 0.00000 |
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| IRS990ScheduleA/PubliclySupportedOrg509a2Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY509Pct | 0 | 0.47010 |
| IRS990ScheduleA/PublicSupportPY509Pct | 0 | 0.00000 |
| IRS990ScheduleA/PublicSupportTotal509Amt | 0 | 142447 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/CurrentTaxYearMinus4YearsAmt | 0 | 7840 |
| IRS990ScheduleA/SubstAndDsqlfyPrsnsTotGrp/TotalAmt | 0 | 7840 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearAmt | 0 | 57340 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus1YearAmt | 0 | 13574 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 21902 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 28538 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 28933 |
| IRS990ScheduleA/Total509Grp/TotalAmt | 0 | 150287 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearAmt | 0 | 82383 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus1YearAmt | 0 | 38595 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus2YearsAmt | 0 | 56950 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus3YearsAmt | 0 | 66087 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus4YearsAmt | 0 | 59022 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/TotalAmt | 0 | 303037 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | ACTIVITY HURRICANE RELIEF FUNDRAISER GRANTEE WORLD CENTRAL KITCHEN STREET 1342 FLORIDA AVE NW CITY, STATE, ZIP WASHINGTON, DC 20009RELATIONSHIP NO RELATION AMOUNT 9,000ACTIVITY FUNDRAISER GRANTEE BILLION OYSTER PROJECT STREET 10 SOUTH STREET SLIP 7 CITY, STATE, ZIP NEW YORK, NY 10004RELATIONSHIP NO RELATION AMOUNT 16,690 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | DESCRIPTION AMOUNTDEPRECIATION FROM 4562 1,607BANK CHARGES 100DUES AND SUBS 39INSURANCE LIABILITY 1,701FILING FEES 125SUPPLIES 898TRAVEL 312WEBSITE 216INTEREST EXPENSE 9OFF-SITE STORAGE 7,500 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | CATEGORY BEGINNING OF YEAR END OF YEARLOANS RECEIVABLE 31,611 31,611142 FT SCHOONER 350,000 350,000FURNITURE AND FIXTURES 4,018 2,411PREPAID EXPENSES 6,824 6,824 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | CATEGORY BEGINNING OF YEAR END OF YEARLOANS PAYABLE 96,927 96,927AMEX CREDIT CARD 0 694 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | List of grants and similar amounts paid Part I line 10 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Description of other expenses Part I line 16 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Description of other assets Part II line 24 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Description of total liabilities Part II line 26 |
| ReturnHeader/BuildTS | 0 | 2021-04-22 16:20:28Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | true |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | MILES PINCUS |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | DIRECTOR |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 5046002673 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2020-11-13 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | MARITIME FOUNDATION |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | MARI |
| ReturnHeader/Filer/EIN | 0 | 465469208 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | 80 SULLIVAN ST |
| ReturnHeader/Filer/USAddress/CityNm | 0 | BROOKLYN |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | NY |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 11231 |
| ReturnHeader/FilingSecurityInformation/AtSubmissionCreationDeviceId | 0 | 397E960473B46C678A27E1312C1A514C950B8392 |
| ReturnHeader/FilingSecurityInformation/AtSubmissionFilingDeviceId | 0 | 397E960473B46C678A27E1312C1A514C950B8392 |
| ReturnHeader/FilingSecurityInformation/FederalOriginalSubmissionId | 0 | 1224032020321kdk0dfb |
| ReturnHeader/FilingSecurityInformation/FederalOriginalSubmissionIdDt | 0 | 2020-11-16 |
| ReturnHeader/FilingSecurityInformation/FilingLicenseTypeCd | 0 | P |
| ReturnHeader/FilingSecurityInformation/IPAddress/IPv4AddressTxt | 0 | 208.125.20.38 |
| ReturnHeader/FilingSecurityInformation/IPDt | 0 | 2020-11-16 |
| ReturnHeader/FilingSecurityInformation/IPTm | 0 | 17:02:40 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmEIN | 0 | 452016241 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt | 0 | Herman Yiu CPA PLLC |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt | 0 | 5 W 37th St 5th Fl |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm | 0 | New York |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd | 0 | NY |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd | 0 | 10018 |
| ReturnHeader/PreparerPersonGrp/PhoneNum | 0 | 2128021428 |
| ReturnHeader/PreparerPersonGrp/PreparationDt | 0 | 2020-11-16 |
| ReturnHeader/PreparerPersonGrp/PreparerPersonNm | 0 | Herman Yiu CPA |
| ReturnHeader/ReturnTs | 0 | 2020-11-16T17:00:43-05:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990EZ |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2019-01-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2019-12-31 |
| ReturnHeader/TaxYr | 0 | 2019 |