| IRS990EZ/ActivitiesNotPreviouslyRptInd | 0 | 0 |
| IRS990EZ/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | THE ORGANIZATION |
| IRS990EZ/BooksInCareOfDetail/PhoneNum | 0 | 5205712202 |
| IRS990EZ/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 6160 E BROADWAY BLVD |
| IRS990EZ/BooksInCareOfDetail/USAddress/CityNm | 0 | TUCSON |
| IRS990EZ/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | AZ |
| IRS990EZ/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 85711 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/BOYAmt | 0 | 2522 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/EOYAmt | 0 | 14119 |
| IRS990EZ/ChgMadeToOrgnzngDocNotRptInd | 0 | 0 |
| IRS990EZ/DirectIndirectPltclExpendAmt | 0 | 0 |
| IRS990EZ/DonorAdvisedFndsInd | 0 | 0 |
| IRS990EZ/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990EZ/ExcessOrDeficitForYearAmt | 0 | -3403 |
| IRS990EZ/FeesAndOtherPymtToIndCntrctAmt | 0 | 1135 |
| IRS990EZ/FiledScheduleAInd | 0 | 1 |
| IRS990EZ/ForeignFinancialAccountInd | 0 | 0 |
| IRS990EZ/ForeignOfficeInd | 0 | 0 |
| IRS990EZ/Form990TotalAssetsGrp/BOYAmt | 0 | 74522 |
| IRS990EZ/Form990TotalAssetsGrp/EOYAmt | 0 | 86119 |
| IRS990EZ/GrossReceiptsAmt | 0 | 0 |
| IRS990EZ/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990EZ/InfoInScheduleOPartIIInd | 0 | X |
| IRS990EZ/InfoInScheduleOPartIInd | 0 | X |
| IRS990EZ/InfoInScheduleOPartVInd | 0 | X |
| IRS990EZ/LobbyingActivitiesInd | 0 | 0 |
| IRS990EZ/MadeLoansToFromOfficersInd | 0 | 0 |
| IRS990EZ/MethodOfAccountingCashInd | 0 | X |
| IRS990EZ/NetAssetsOrFundBalancesBOYAmt | 0 | -1478 |
| IRS990EZ/NetAssetsOrFundBalancesEOYAmt | 0 | -4881 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/BOYAmt | 0 | -1478 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/EOYAmt | 0 | -4881 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 0 | 2.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 1 | 10.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 2 | 5.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/EmployeeBenefitProgramAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/ExpenseAccountOtherAllwncAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 0 | DAVID DRAPER |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 1 | ROBERT DRAPER |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 2 | CATHERINE V SERTICH |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 0 | DIRECTOR |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 1 | PRESIDENT/CLERK/DIRECTOR |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 2 | TREASURER |
| IRS990EZ/OperateHospitalInd | 0 | 0 |
| IRS990EZ/Organization501c3Ind | 0 | X |
| IRS990EZ/OrganizationDissolvedEtcInd | 0 | 0 |
| IRS990EZ/OrganizationHadUBIInd | 0 | 0 |
| IRS990EZ/OtherAssetsTotalDetail/BOYAmt | 0 | 72000 |
| IRS990EZ/OtherAssetsTotalDetail/EOYAmt | 0 | 72000 |
| IRS990EZ/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990EZ/OtherExpensesTotalAmt | 0 | 2268 |
| IRS990EZ/PartVIHghstPdCntrctProfSrvcTxt | 0 | NONE |
| IRS990EZ/PartVIOfCompOfHghstPdEmplTxt | 0 | NONE |
| IRS990EZ/PoliticalCampaignActyInd | 0 | 0 |
| IRS990EZ/PrimaryExemptPurposeTxt | 0 | TO RESTORE AND PRESERVE FOR FUTURE GENERATIONS LIGHTHOUSES DEEMED EXCESS PURSUANT TO THE NATIONAL LIGHTHOUSE HISTORIC PRESERVATION ACT OF 2000; TO SECURE THE FUNCTION OF SUCH LIGHTHOUSES AND TO ENSURE THAT SUCH LIGHTHOUSES REMAIN USEFUL AND IMPORTANT TO THEIR LOCAL COMMUNITIES; TO DOCUMENT THE HISTORY OF SUCH LIGHTHOUSES AND THEIR KEEPERS. |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 0 | IN DECEMBER 2017 THE ORGANIZATION ACQUIRED THE BUTLER FLATS LIGHTHOUSE IN NEW BEDFORD, MASSACHUSETTS FROM THE GSA AUCTION TO RESTORE AND PRESERVE IT FOR FUTURE GENERATIONS. IN 2018 AND 2019, THE ORGANIZATION FOCUSED ON CREATING A PLAN TO BEST ACCOMPLISH ITS GOALS. |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 0 | 0 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 0 | 0 |
| IRS990EZ/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990EZ/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990EZ/ScheduleBNotRequiredInd | 0 | X |
| IRS990EZ/SchoolOperatingInd | 0 | 0 |
| IRS990EZ/StatesWhereCopyOfReturnIsFldCd | 0 | MA |
| IRS990EZ/SubjectToProxyTaxInd | 0 | 0 |
| IRS990EZ/SumOfTotalLiabilitiesGrp/BOYAmt | 0 | 76000 |
| IRS990EZ/SumOfTotalLiabilitiesGrp/EOYAmt | 0 | 91000 |
| IRS990EZ/TanningServicesProvidedInd | 0 | 0 |
| IRS990EZ/TaxImposedOnOrganizationMgrAmt | 0 | 0 |
| IRS990EZ/TaxImposedUnderIRC4911Amt | 0 | 0 |
| IRS990EZ/TaxImposedUnderIRC4912Amt | 0 | 0 |
| IRS990EZ/TaxImposedUnderIRC4955Amt | 0 | 0 |
| IRS990EZ/TaxReimbursedByOrganizationAmt | 0 | 0 |
| IRS990EZ/TotalExpensesAmt | 0 | 3403 |
| IRS990EZ/TotalProgramServiceExpensesAmt | 0 | 0 |
| IRS990EZ/TotalRevenueAmt | 0 | 0 |
| IRS990EZ/TrnsfrExmptNonChrtblRltdOrgInd | 0 | 0 |
| IRS990EZ/TypeOfOrganizationCorpInd | 0 | X |
| IRS990EZ/WebsiteAddressTxt | 0 | N/A |
| IRS990ScheduleA/First5Years170Ind | 0 | X |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 0 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 0 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | DESCRIPTION: COMPUTER EXPENSES. AMOUNT: 436. DESCRIPTION: BANK FEES. AMOUNT: 182. DESCRIPTION: INSURANCE. AMOUNT: 1,615. DESCRIPTION: STATE TAX EXPENSE. AMOUNT: 35. TOTAL TO FORM 990-EZ, LINE 16: 2,268. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | DESCRIPTION: BUTLER FLATS LIGHTHOUSE IN NEW BEDFORD, MA. BEG. OF YEAR AMOUNT: 72,000. END OF YEAR AMOUNT: 72,000. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | DESCRIPTION: LOAN FROM RELATED PARTY. BEG. OF YEAR AMOUNT: 76,000. END OF YEAR AMOUNT: 91,000. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | FORM 990-EZ, PART I, LINE 16 - OTHER EXPENSES |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | FORM 990-EZ, PART II, LINE 24 - OTHER ASSETS |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | FORM 990-EZ, PART II, LINE 26 - OTHER LIABILITIES |
| TransferPrsnlBnftContractsDecl/DeclarationDesc | 0 | THE ORGANIZATION DID NOT, DURING THE YEAR, RECEIVE ANY FUNDS, DIRECTLY,OR INDIRECTLY, TO PAY PREMIUMS ON A PERSONAL BENEFIT CONTRACT.THE ORGANIZATION, DID NOT, DURING THE YEAR, PAY ANY PREMIUMS, DIRECTLY,OR INDIRECTLY, ON A PERSONAL BENEFIT CONTRACT. |
| ReturnHeader/BuildTS | 0 | 2020-11-06 18:47:13Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | 1 |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | ROBERT DRAPER |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | PRESIDENT |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 5205712298 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2020-08-14 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | MASS LIGHT LTD |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | MASS |
| ReturnHeader/Filer/EIN | 0 | 823440026 |
| ReturnHeader/Filer/PhoneNum | 0 | 5205712298 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | PO BOX 31000 |
| ReturnHeader/Filer/USAddress/CityNm | 0 | TUCSON |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | AZ |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 85751 |
| ReturnHeader/FilingSecurityInformation/AtSubmissionCreationDeviceId | 0 | 39325364994FA50199F2AEE3DC4076DB28CADE46 |
| ReturnHeader/FilingSecurityInformation/AtSubmissionFilingDeviceId | 0 | 7BE28695D57470A8D8369E27FF2CE614EDCBF3C9 |
| ReturnHeader/FilingSecurityInformation/FilingLicenseTypeCd | 0 | P |
| ReturnHeader/FilingSecurityInformation/IPAddress/IPv4AddressTxt | 0 | 64.119.44.186 |
| ReturnHeader/FilingSecurityInformation/IPDt | 0 | 2020-08-14 |
| ReturnHeader/FilingSecurityInformation/IPTimezoneCd | 0 | US |
| ReturnHeader/FilingSecurityInformation/IPTm | 0 | 11:09:54 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmEIN | 0 | 860550947 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt | 0 | R & A CPAS A PROFESSIONAL CORPORATION |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt | 0 | 4542 E CAMP LOWELL STE 100 |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm | 0 | TUCSON |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd | 0 | AZ |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd | 0 | 85712 |
| ReturnHeader/PreparerPersonGrp/PhoneNum | 0 | 5208814900 |
| ReturnHeader/PreparerPersonGrp/PreparerPersonNm | 0 | AMY CHAVEZ |
| ReturnHeader/ReturnTs | 0 | 2020-08-17T12:11:42-05:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990EZ |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2019-01-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2019-12-31 |
| ReturnHeader/TaxYr | 0 | 2019 |