| IRS990/AccountantCompileOrReviewInd | 0 | true |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | SUPPORT OF THE PUBLIC LIBRARY. |
| IRS990/AllOtherContributionsAmt | 0 | 34509 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | PAUL STONE |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 4063631670 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 306 STATE STREET |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine2Txt | 0 | 306 STATE STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | HAMILTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MT |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 59840 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 10883 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 43908 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | false |
| IRS990/CompensationProcessOtherInd | 0 | false |
| IRS990/ConflictOfInterestPolicyInd | 0 | false |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 34509 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 36726 |
| IRS990/CYOtherExpensesAmt | 0 | 14730 |
| IRS990/CYOtherRevenueAmt | 0 | 1600 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 36 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 58141 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/CYTotalExpensesAmt | 0 | 14730 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 72871 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/Desc | 0 | CONTRIBUTIONS ARE SOLICITED TO SUSTAIN A FUND FOR THE SUPPORT AND FUTURE EXPANSION OF THE PUBLIC LIBRARY. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 0 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 14730 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 1050 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 1050 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 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/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | 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/PersonNm | 0 | DIANE KING |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | JONI LODMELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | LESLIE STRONG MOORE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | NIKI SHONKWEILER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | PAUL STONE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | FREDRICK TOSSBERG |
| 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/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/TitleTxt | 0 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | CHAIRMAN/DIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedInd | 0 | false |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/FundraisingGrossIncomeAmt | 0 | 1600 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 2604 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 13547 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 6 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/OtherAmt | 0 | 2604 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 144142 |
| IRS990/GrossReceiptsAmt | 0 | 203466 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | false |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
| IRS990/IndependentVotingMemberCnt | 0 | 5 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InvestmentIncomeGrp/RelatedOrExemptFuncIncomeAmt | 0 | 20575 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 20575 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 763408 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 792094 |
| IRS990/IRPDocumentCnt | 0 | 0 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LegalDomicileStateCd | 0 | MT |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 130595 |
| 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 | SUPPORT OF THE PUBLIC LIBRARY. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 774290 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 836002 |
| IRS990/NetGainOrLossInvestmentsGrp/RelatedOrExemptFuncIncomeAmt | 0 | 16151 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 16151 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 1600 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 3571 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 826 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 826 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherExpensesGrp/Desc | 0 | TRUSTEE FEES |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 8408 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 8408 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 1 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PaymentsToAffiliatesGrp/ProgramServicesAmt | 0 | 4446 |
| IRS990/PaymentsToAffiliatesGrp/TotalAmt | 0 | 4446 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrincipalOfficerNm | 0 | JONI LODMELL |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | POSTER & CARD SALES |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 36 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 36 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 82067 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 100 |
| IRS990/PYInvestmentIncomeAmt | 0 | 29669 |
| IRS990/PYOtherExpensesAmt | 0 | 23628 |
| IRS990/PYOtherRevenueAmt | 0 | 3328 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 74 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 88809 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 2601 |
| IRS990/PYTotalExpensesAmt | 0 | 26329 |
| IRS990/PYTotalRevenueAmt | 0 | 115138 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 58141 |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | false |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | false |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 36 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/AdjustedGrossIncomeGrp/PriorYearAmt | 0 | 33071 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/DepreciationDepletionGrp/PriorYearAmt | 0 | 0 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/NetSTCapitalGainAdjNetIncmGrp/PriorYearAmt | 0 | 0 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/OtherExpensesGrp/PriorYearAmt | 0 | 0 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/OtherGrossIncomeGrp/PriorYearAmt | 0 | 33071 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/ProductionIncomeGrp/PriorYearAmt | 0 | 26329 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/RecoveriesPYDistributionsGrp/PriorYearAmt | 0 | 0 |
| IRS990ScheduleA/AdjustedNetIncomeGrp/TotalAdjustedNetIncomeGrp/PriorYearAmt | 0 | 6742 |
| IRS990ScheduleA/DistributableAmountGrp/CYAdjNetIncomeDistributableAmt | 0 | 6742 |
| IRS990ScheduleA/DistributableAmountGrp/CYDistributableAsAdjustedAmt | 0 | 22391 |
| IRS990ScheduleA/DistributableAmountGrp/CYGreaterAdjustedMinimumAmt | 0 | 22391 |
| IRS990ScheduleA/DistributableAmountGrp/CYIncomeTaxImposedPYAmt | 0 | 0 |
| IRS990ScheduleA/DistributableAmountGrp/CYPct85AdjustedNetIncomeAmt | 0 | 5731 |
| IRS990ScheduleA/DistributableAmountGrp/CYTotalMinAstDistributableAmt | 0 | 22391 |
| IRS990ScheduleA/DistributionAllocationsGrp/CarryoverPYNotAppliedAmt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/CYDistribAppUnderdistriPYAmt | 0 | 4446 |
| IRS990ScheduleA/DistributionAllocationsGrp/CYDistributableAsAdjustedAmt | 0 | 22391 |
| IRS990ScheduleA/DistributionAllocationsGrp/CyovAppliedUnderdistrCPYAmt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/CyovAppliedUnderdistriPYAmt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/CYTotalAnnualDistributionsAmt | 0 | 4446 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistributionAmt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistributionCyovAmt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistributionCyovYr1Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistributionCyovYr2Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistributionCyovYr3Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistributionCyovYr4Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistributionCyovYr5Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessDistriCyovToNextYrAmt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessFromYear1Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessFromYear2Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessFromYear3Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessFromYear4Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/ExcessFromYear5Amt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/RemainingUnderdistriCYAmt | 0 | 22391 |
| IRS990ScheduleA/DistributionAllocationsGrp/RemainingUnderdistriPYAmt | 0 | 44846 |
| IRS990ScheduleA/DistributionAllocationsGrp/TotalExcessDistributionCyovAmt | 0 | 0 |
| IRS990ScheduleA/DistributionAllocationsGrp/UnderdistributionsAmt | 0 | 49292 |
| IRS990ScheduleA/DistributionsGrp/CYAdministrativeExpensePaidAmt | 0 | 0 |
| IRS990ScheduleA/DistributionsGrp/CYDistriAttentiveSuprtOrgAmt | 0 | 4446 |
| IRS990ScheduleA/DistributionsGrp/CYDistributableAsAdjustedAmt | 0 | 22391 |
| IRS990ScheduleA/DistributionsGrp/CYDistributionYrRt | 0 | 0.198562000000 |
| IRS990ScheduleA/DistributionsGrp/CYOtherDistributionsAmt | 0 | 0 |
| IRS990ScheduleA/DistributionsGrp/CYPaidAccomplishExemptPrpsAmt | 0 | 4446 |
| IRS990ScheduleA/DistributionsGrp/CYPdInExcessIncomeActivityAmt | 0 | 0 |
| IRS990ScheduleA/DistributionsGrp/CYTotalAnnualDistributionsAmt | 0 | 4446 |
| IRS990ScheduleA/DistributionsGrp/ExemptUseAssetsAcquisPaidAmt | 0 | 0 |
| IRS990ScheduleA/DistributionsGrp/QualifiedSetAsideAmt | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/Contribution35ControlledInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionControllerInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionFamilyInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ControlledDisqualifiedPrsnInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnControllIntInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnOwnrIntInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ExcessBusinessHoldingsRulesInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ListedByNameGoverningDocInd | 0 | true |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/LoanDisqualifiedPersonInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/OrganizationChangeSuprtOrgInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/PaymentSubstantialContribtrInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgNotOrganizedUSInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgSectionC456Ind | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportNonSupportedOrgInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SuprtOrgNoIRSDeterminationInd | 0 | false |
| IRS990ScheduleA/Form990SchAType3SprtOrgAllGrp/OfficersCloseRelationshipInd | 0 | true |
| IRS990ScheduleA/Form990SchAType3SprtOrgAllGrp/SupportedOrgVoiceInvestmentInd | 0 | false |
| IRS990ScheduleA/Form990SchAType3SprtOrgAllGrp/TimelyProvidedDocumentsInd | 0 | false |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/ExplanationTxt | 0 | CASH IS BEING HELD WITHHIN THE FOUNDATION ACCOUNTS TO ENABLE GREATER EARNINGS POTENTIAL. CURRENT AND FUTURE EARNINGS ARE DESIGNATED TO SUPPORT THE BITTERROOT PUBLIC LIBRARY BOTH CURRENTLY AND FOR FUTURE EXPANSION. AS OF THE CURRENT TIME, THE LIBRARY HAS NOT NEEDED EXTRA CASH FOR SUPPORT. THEREFORE, THE CASH IS BEING CONTINUALLY REINVESTED TO HELP GENERATE GREATER FUTURE VALUE. |
| IRS990ScheduleA/Form990ScheduleAPartVIGrp/FormAndLineReferenceDesc | 0 | PART V, SECTION B, LINE 4 |
| IRS990ScheduleA/MinimumAssetAmountGrp/AcquisitionIndebtednessGrp/PriorYearAmt | 0 | 0 |
| IRS990ScheduleA/MinimumAssetAmountGrp/AdjustedFMVLessIndebtednessGrp/PriorYearAmt | 0 | 649497 |
| IRS990ScheduleA/MinimumAssetAmountGrp/AverageMonthlyCashBalancesGrp/PriorYearAmt | 0 | 41119 |
| IRS990ScheduleA/MinimumAssetAmountGrp/AverageMonthlyFMVOfSecGrp/PriorYearAmt | 0 | 608378 |
| IRS990ScheduleA/MinimumAssetAmountGrp/CashDeemedCharitableGrp/PriorYearAmt | 0 | 9742 |
| IRS990ScheduleA/MinimumAssetAmountGrp/DiscountClaimedAmt | 0 | 0 |
| IRS990ScheduleA/MinimumAssetAmountGrp/FMVOtherNonExemptUseAssetGrp/PriorYearAmt | 0 | 0 |
| IRS990ScheduleA/MinimumAssetAmountGrp/NetVlNonExemptUseAssetsGrp/PriorYearAmt | 0 | 639755 |
| IRS990ScheduleA/MinimumAssetAmountGrp/PctOfNetVlNonExemptUseAstGrp/PriorYearAmt | 0 | 22391 |
| IRS990ScheduleA/MinimumAssetAmountGrp/RecoveriesPYDistriMinAssetGrp/PriorYearAmt | 0 | 0 |
| IRS990ScheduleA/MinimumAssetAmountGrp/TotalFMVOfNonExemptUseAssetGrp/PriorYearAmt | 0 | 649497 |
| IRS990ScheduleA/MinimumAssetAmountGrp/TotalMinimumAssetGrp/PriorYearAmt | 0 | 22391 |
| IRS990ScheduleA/OtherSupportSumAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrganizationsCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrganizationsTotalCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrgInformationGrp/EIN | 0 | 816001270 |
| IRS990ScheduleA/SupportedOrgInformationGrp/GoverningDocumentListedInd | 0 | true |
| IRS990ScheduleA/SupportedOrgInformationGrp/OrganizationTypeCd | 0 | 10 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OtherSupportAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportAmt | 0 | 4446 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportedOrganizationName/BusinessNameLine1Txt | 0 | BITTERROOT PUBLIC LIBRARY |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportedOrganizationName/BusinessNameLine2Txt | 0 | BITTERROOT PUBLIC LIBRARY |
| IRS990ScheduleA/SupportingOrganization509a3Ind | 0 | X |
| IRS990ScheduleA/SupportingOrgType3NonFuncInd | 0 | X |
| IRS990ScheduleA/SupportSumAmt | 0 | 4446 |
| 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 |
| IRS990/ScheduleJRequiredInd | 0 | false |
| IRS990/ScheduleORequiredInd | 0 | true |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | THE BOARD OF DIRECTORS REVIEWS THE 990 AFTER IT IS RECIEVED FROM THE CPA FIRM. IF THERE ARE QUESTIONS OR CONCERNS, THE BOARD REQUESTS THE CPA FIRM TO EITHER CONFIRM OR ADJUST THE INFORMATION PRESENTED TO PROVIDE A COMPLETE AND ACCURATE FILING. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | IF A CONFLICT OF INTEREST ARISES, THE PARTY INVOLVED EITHER EXCUSES HIM OR HERSELF OR THE BOARD REQUESTS THE PARTY TO ABSTAIN FROM VOTING ON THE ISSUE AT HAND. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | DOCUMENTS ARE MADE AVAILABLE TO THE PUBLIC AT THE LIBRARY DURING NORMAL BUSINESS HOURS. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | ADJUSTED PRIOR YEAR FUND BALANCE TO MATCH ACCOUNTING RECORDS |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | FORM 990, PAGE 6, PART VI, LINE 11B |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | FORM 990, PAGE 6, PART VI, LINE 12C |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | FORM 990, PAGE 6, PART VI, LINE 19 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | FORM 990, PART XI, LINE 9 |
| IRS990/SchoolOperatingInd | 0 | false |
| IRS990/SignificantChangeInd | 0 | false |
| IRS990/SignificantNewProgramSrvcInd | 0 | false |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | false |
| IRS990/SubjectToProxyTaxInd | 0 | false |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | false |
| IRS990/TaxablePartyNotificationInd | 0 | false |
| IRS990/TaxExemptBondsInd | 0 | false |
| IRS990/TempOrPermanentEndowmentsInd | 0 | false |
| IRS990/TerminateOperationsInd | 0 | false |
| IRS990/TotalAssetsBOYAmt | 0 | 774291 |
| IRS990/TotalAssetsEOYAmt | 0 | 836002 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 774291 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 836002 |
| IRS990/TotalCompGreaterThan150KInd | 0 | false |
| IRS990/TotalContributionsAmt | 0 | 34509 |
| IRS990/TotalEmployeeCnt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt | 0 | 14730 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 14730 |
| IRS990/TotalGrossUBIAmt | 0 | 0 |
| IRS990/TotalLiabilitiesBOYAmt | 0 | 1 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 1 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt | 0 | 774290 |
| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 836002 |
| IRS990/TotalProgramServiceExpensesAmt | 0 | 14730 |
| IRS990/TotalProgramServiceRevenueAmt | 0 | 36 |
| IRS990/TotalRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 36762 |
| IRS990/TotalRevenueGrp/TotalRevenueColumnAmt | 0 | 72871 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/BOYAmt | 0 | 774291 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/EOYAmt | 0 | 836002 |
| IRS990/TrnsfrExmptNonChrtblRltdOrgInd | 0 | false |
| IRS990/TypeOfOrganizationCorpInd | 0 | X |
| IRS990/UnrelatedBusIncmOverLimitInd | 0 | false |
| IRS990/UnrestrictedNetAssetsGrp/BOYAmt | 0 | 774290 |
| IRS990/UnrestrictedNetAssetsGrp/EOYAmt | 0 | 836002 |
| IRS990/UponRequestInd | 0 | X |
| IRS990/USAddress/AddressLine1Txt | 0 | 306 STATE ST |
| IRS990/USAddress/CityNm | 0 | HAMILTON |
| IRS990/USAddress/StateAbbreviationCd | 0 | MT |
| IRS990/USAddress/ZIPCd | 0 | 59840 |
| IRS990/VotingMembersGoverningBodyCnt | 0 | 6 |
| IRS990/VotingMembersIndependentCnt | 0 | 5 |
| IRS990/WhistleblowerPolicyInd | 0 | false |
| ReturnHeader/BuildTS | 0 | 2020-04-17 16:48:07Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | true |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | PAUL STONE |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | TREASURER |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2019-11-07 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | BITTERROOT PUBLIC LIBRARY |
| ReturnHeader/Filer/BusinessName/BusinessNameLine2Txt | 0 | FOUNDATION INC |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | BITT |
| ReturnHeader/Filer/EIN | 0 | 363687402 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | 306 STATE STREET |
| ReturnHeader/Filer/USAddress/CityNm | 0 | HAMILTON |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | MT |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 59840 |
| ReturnHeader/FilingSecurityInformation/AtSubmissionCreationDeviceId | 0 | 22EA0B8AD57450C42935F5EF8C841421B8840EAA |
| ReturnHeader/FilingSecurityInformation/AtSubmissionFilingDeviceId | 0 | 22EA0B8AD57450C42935F5EF8C841421B8840EAA |
| ReturnHeader/FilingSecurityInformation/FilingLicenseTypeCd | 0 | P |
| ReturnHeader/FilingSecurityInformation/IPAddress/IPv4AddressTxt | 0 | 47.37.56.9 |
| ReturnHeader/FilingSecurityInformation/IPDt | 0 | 2019-11-15 |
| ReturnHeader/FilingSecurityInformation/IPTimezoneCd | 0 | CS |
| ReturnHeader/FilingSecurityInformation/IPTm | 0 | 14:30:46 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmEIN | 0 | 822949077 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt | 0 | DAVIS GROUP PLLC |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt | 0 | 178 S THIRD ST |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm | 0 | HAMILTON |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd | 0 | MT |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd | 0 | 598402720 |
| ReturnHeader/PreparerPersonGrp/PhoneNum | 0 | 4063632225 |
| ReturnHeader/PreparerPersonGrp/PreparationDt | 0 | 2019-11-07 |
| ReturnHeader/PreparerPersonGrp/PreparerPersonNm | 0 | DOUGLAS J DAVIS |
| ReturnHeader/ReturnTs | 0 | 2019-11-15T14:30:46-06:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990 |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2018-07-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2019-06-30 |
| ReturnHeader/TaxYr | 0 | 2018 |