| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 19256 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 114713 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | SEE SCHEDULE O |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 38423 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 38423 |
| IRS990/AllOtherContributionsAmt | 0 | 5456917 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | ANNIE M URBAN |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 7242389701 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 200 SOUTH MARKET STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | LIGONIER |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | PA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 15658 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 98287 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 79151 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 1 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 49875 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 24937 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 24937 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 99749 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 1 |
| IRS990/ContriRptFundraisingEventAmt | 0 | 60012 |
| IRS990/CostOfGoodsSoldAmt | 0 | 57079 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 5530790 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 359926 |
| IRS990/CYOtherExpensesAmt | 0 | 524957 |
| IRS990/CYOtherRevenueAmt | 0 | 72031 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 174142 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 5007645 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 556287 |
| IRS990/CYTotalExpensesAmt | 0 | 1129244 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 326143 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 48000 |
| IRS990/CYTotalRevenueAmt | 0 | 6136889 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 1 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 6965 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 8472 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 139489 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 139489 |
| IRS990/Desc | 0 | EACH YEAR FORT LIGONIER WELCOMES 20,000-25,000 VISITORS. VISITORS INCLUDE STUDENTS IN K-12 (PUBLIC, PRIVATE AND HOME SCHOOLS), COLLEGE STUDENTS, MOTORCOACH TOURS, SCOUTS, EDUCATORS, HISTORIANS AND FAMILIES. THROUGHOUT EACH YEAR, FORT LIGONIER HOSTS A VARIETY OF LIVING HISTORY PROGRAMS, LECTURES AND WORKSHOPS. OUR EDUCATION DEPARTMENT HAS DEVELOPED NEW TOUR PROGRAMS, AS WELL AS EDUCATIONAL ACTIVITIES TO INTEGRATE HISTORY WITH MULTIPLE DISCIPLINES OF SCIENCE, TECHNOLOGY, ENGINEERING, THE ARTS AND MATH. FORT LIGONIER IS AN APPROVED PROFESSIONAL EDUCATION PROVIDER FOR TEACHERS THROUGH THE COMMONWEALTH OF PENNSYLVANIA DEPARTMENT OF EDUCATION AND A PROGRAM PROVIDER THROUGH THE PENNSYLVANIA EDUCATIONAL IMPROVEMENT TAX CREDIT PROGRAM. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 1 |
| IRS990/EmployeeCnt | 0 | 22 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 664029 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 20299 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 20299 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 60323 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 60323 |
| IRS990/FeesForServicesProfFundraising/FundraisingAmt | 0 | 48000 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 48000 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ProgramServicesAmt | 0 | 3596 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 3596 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 6.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 6.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 6.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 4.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 22 | 3.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 23 | 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/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 22 | 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/OtherCompensationAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 6749 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | RALPH KINNEY BENNETT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | JOSEPH M BYERS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | T JEFFREY COOK ESQ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | STEPHEN R GOODER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | JO ROSSI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | THE HON JOHN D ONG |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | JAMES PARKER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | CLARA L PASCOE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | RONALD M PETNUCH ESQUIRE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | HENRY C SCULLY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | JOSEPH VELLA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | EDWARD R WEIDLEIN III |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | CARL L CAMPBELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | RICHARD K DANFORTH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | PAUL FRY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | STEPHEN H GREER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | DIRK MATSON PHD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | MOLLY WALTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | JOHN AVLON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | BILL STABLEIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | CHARLES A FAGAN III |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | LYNN A SCALISE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | PATRICK R WALLACE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | ANNIE M URBAN |
| 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 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 23 | 93000 |
| 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/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TRUSTEE EMERITUS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | VICE PRESIDENT & TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | SECRETARY & TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | PRESIDENT & TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | TREASURER & TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | TRUSTEE EMERITUS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | EXECUTIVE DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1946 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 60012 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 44937 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 78695 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 277563 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 21 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 2118729 |
| IRS990/GrossReceiptsAmt | 0 | 8080071 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 95110 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 21 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 19450 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 19450 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 51291 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 43208 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 82363 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 82363 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 1967853 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 2026878 |
| IRS990/IRPDocumentCnt | 0 | 4 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 4549701 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 3899958 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 3840357 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 8390058 |
| IRS990/LegalDomicileStateCd | 0 | PA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 1841166 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembershipDuesAmt | 0 | 13861 |
| IRS990/MembersOrStockholdersInd | 0 | 1 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | THE PRINCIPAL OBJECTIVE OF THE MUSEUM, RECONSTRUCTED/RESTORED FORT AND HISTORIC SITE, IS TO PROVIDE AN EDUCATIONAL OPPORTUNITY FOR THE AUDIENCE TO APPRECIATE AND TO UNDERSTAND A SIGNIFICANT ASPECT OF HUMAN EXPERIENCE IN THE 18TH CENTURY, AND TO PROMOTE AN AWARENESS OF THIS CRITICAL AND DECISIVE PERIOD IN HISTORY. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 7200716 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 11738365 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 277563 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 277563 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 33758 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 33758 |
| IRS990/NetIncomeOrLossGrp/RelatedOrExemptFuncIncomeAmt | 0 | 38031 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 38031 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -469996 |
| IRS990/NoncashContributionsAmt | 0 | 302426 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 112950 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 112950 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 33786 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 33786 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 231743 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 198448 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 36595 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 18297 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 18297 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 73189 |
| IRS990/OtherExpensesGrp/Desc | 0 | MISCELLANEOUS |
| IRS990/OtherExpensesGrp/Desc | 1 | PROGRAMMING |
| IRS990/OtherExpensesGrp/Desc | 2 | EXHIBITS & CONSERVATION |
| IRS990/OtherExpensesGrp/Desc | 3 | DUES & LICENSE FEES |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 41574 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 37786 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 4200 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 3843 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 41574 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 37786 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 4200 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 3843 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | MISCELLANEOUS |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 242 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 242 |
| IRS990/OtherRevenueTotalAmt | 0 | 242 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 157987 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 78994 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 78994 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 315975 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 22809 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 11405 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 11405 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 45619 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 10877 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 5439 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 5439 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 21755 |
| IRS990/PermanentlyRstrNetAssetsGrp/BOYAmt | 0 | 2088200 |
| IRS990/PermanentlyRstrNetAssetsGrp/EOYAmt | 0 | 2042722 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 309274 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 655674 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 550 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 550 |
| IRS990/PrincipalOfficerNm | 0 | EDWARD R WEIDLEIN III |
| IRS990/ProfessionalFundraisingInd | 0 | 1 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | MUSEUM ADMISSIONS |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | EDUCATIONAL OUTREACH |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | SPECIAL EVENTS |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 152311 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 16981 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 4850 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 152311 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 16981 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 4850 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 785524 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 198472 |
| IRS990/PYOtherExpensesAmt | 0 | 450017 |
| IRS990/PYOtherRevenueAmt | 0 | 66815 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 161861 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 268737 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 417855 |