| IRS990EZ/ActivitiesNotPreviouslyRptInd | 0 | false |
| IRS990EZ/BooksInCareOfDetail/PersonNm | 0 | RHONA MEISLIK |
| IRS990EZ/BooksInCareOfDetail/PhoneNum | 0 | 4068620387 |
| IRS990EZ/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 161 RIDGE RUN DRIVE |
| IRS990EZ/BooksInCareOfDetail/USAddress/CityNm | 0 | WHITEFISH |
| IRS990EZ/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MT |
| IRS990EZ/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 59937 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/BOYAmt | 0 | 38226 |
| IRS990EZ/CashSavingsAndInvestmentsGrp/EOYAmt | 0 | 57056 |
| IRS990EZ/ChgMadeToOrgnzngDocNotRptInd | 0 | false |
| IRS990EZ/ContributionsGiftsGrantsEtcAmt | 0 | 39105 |
| IRS990EZ/CostOfGoodsSoldAmt | 0 | 0 |
| IRS990EZ/CostOrOtherBasisExpenseSaleAmt | 0 | 0 |
| IRS990EZ/DonorAdvisedFndsInd | 0 | false |
| IRS990EZ/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990EZ/ExcessOrDeficitForYearAmt | 0 | 18830 |
| IRS990EZ/FiledScheduleAInd | 0 | true |
| IRS990EZ/ForeignFinancialAccountInd | 0 | false |
| IRS990EZ/ForeignOfficeInd | 0 | false |
| IRS990EZ/Form1120PolFiledInd | 0 | false |
| IRS990EZ/Form720FiledInd | 0 | false |
| IRS990EZ/Form990TotalAssetsGrp/BOYAmt | 0 | 38226 |
| IRS990EZ/Form990TotalAssetsGrp/EOYAmt | 0 | 57056 |
| IRS990EZ/FundraisingGrossIncomeAmt | 0 | 0 |
| IRS990EZ/GrantsAndSimilarAmountsPaidAmt | 0 | 18531 |
| IRS990EZ/GrossReceiptsAmt | 0 | 39302 |
| IRS990EZ/GrossReceiptsForPublicUseAmt | 0 | 0 |
| IRS990EZ/InfoInScheduleOPartIInd | 0 | X |
| IRS990EZ/InitiationFeesAndCapContriAmt | 0 | 0 |
| IRS990EZ/InvestmentIncomeAmt | 0 | 197 |
| IRS990EZ/LobbyingActivitiesInd | 0 | false |
| IRS990EZ/MadeLoansToFromOfficersInd | 0 | false |
| IRS990EZ/MethodOfAccountingCashInd | 0 | X |
| IRS990EZ/NetAssetsOrFundBalancesBOYAmt | 0 | 38226 |
| IRS990EZ/NetAssetsOrFundBalancesEOYAmt | 0 | 57056 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/BOYAmt | 0 | 38226 |
| IRS990EZ/NetAssetsOrFundBalancesGrp/EOYAmt | 0 | 57056 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 0 | 4.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 1 | 4.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 2 | 4.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/AverageHrsPerWkDevotedToPosRt | 3 | 4.00 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 0 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 1 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 2 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/CompensationAmt | 3 | 0 |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 0 | BEN DEVALL |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 1 | CHRISTOPHER HEATHMAN |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 2 | ROBYN HEATHMAN |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/PersonNm | 3 | RHONA MEISLIK |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 0 | President |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 1 | Director |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 2 | Secretary |
| IRS990EZ/OfficerDirectorTrusteeEmplGrp/TitleTxt | 3 | Treasurer |
| IRS990EZ/OperateHospitalInd | 0 | false |
| IRS990EZ/Organization501c3Ind | 0 | X |
| IRS990EZ/OrganizationDissolvedEtcInd | 0 | false |
| IRS990EZ/OrganizationFiled990TInd | 0 | false |
| IRS990EZ/OrganizationHadUBIInd | 0 | false |
| IRS990EZ/OtherExpensesTotalAmt | 0 | 116 |
| IRS990EZ/PartVIHghstPdCntrctProfSrvcTxt | 0 | NONE |
| IRS990EZ/PartVIOfCompOfHghstPdEmplTxt | 0 | NONE |
| IRS990EZ/PoliticalCampaignActyInd | 0 | false |
| IRS990EZ/PrimaryExemptPurposeTxt | 0 | FUNDRAISING TO PURCHASE FIREFIGHTING EQUIPMENT FOR THE BIG MOUNTAIN FIRE DISTRICT |
| IRS990EZ/PrintingPublicationsPostageAmt | 0 | 1825 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/DescriptionProgramSrvcAccomTxt | 0 | THE BIG MOUNTAIN FIREFIGHTERS ASSOCIATION HOLDS SPECIAL FUNDRAISING EVENTS AND SELLS MERCHANDISE WITH THE SPECIFIC PURPOSE OF RAISING MONIES TO PURCHASE FIREFIGHTING AND FIREHALL EQUIPMENT FOR THE BIG MOUNTAIN FIRE DISTRICT. |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/GrantsAndAllocationsAmt | 0 | 1941 |
| IRS990EZ/ProgramSrvcAccomplishmentGrp/ProgramServiceExpensesAmt | 0 | 18531 |
| IRS990EZ/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990EZ/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990EZ/RelatedOrgSect527OrgInd | 0 | false |
| IRS990EZ/ScheduleBNotRequiredInd | 0 | X |
| IRS990EZ/SchoolOperatingInd | 0 | false |
| IRS990EZ/SpecialEventsDirectExpensesAmt | 0 | 0 |
| IRS990EZ/SubjectToProxyTaxInd | 0 | false |
| IRS990EZ/TanningServicesProvidedInd | 0 | false |
| IRS990EZ/TotalExpensesAmt | 0 | 20472 |
| IRS990EZ/TotalProgramServiceExpensesAmt | 0 | 1941 |
| IRS990EZ/TotalRevenueAmt | 0 | 39302 |
| IRS990EZ/TransactionWithControlEntInd | 0 | false |
| IRS990EZ/TrnsfrExmptNonChrtblRltdOrgInd | 0 | false |
| IRS990EZ/TypeOfOrganizationAssocInd | 0 | X |
| IRS990EZ/WebsiteAddressTxt | 0 | N/A |
| IRS990ScheduleA/AmountsRcvdDsqlfyPersonGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearAmt | 0 | 39105 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus1YearAmt | 0 | 34890 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 31205 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 25925 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 31717 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/TotalAmt | 0 | 162842 |
| IRS990ScheduleA/GovtFurnSrvcFcltsVl509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearAmt | 0 | 197 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 72 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 62 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 4215 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 66 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/TotalAmt | 0 | 4612 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/GrossReceiptsNonUnrltBusGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearAmt | 0 | 197 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 72 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 62 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 4215 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 66 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/TotalAmt | 0 | 4612 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0.02750 |
| IRS990ScheduleA/InvestmentIncomePYPct | 0 | 0.02750 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/OtherIncome509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/Post1975UBTIGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/PubliclySupportedOrg509a2Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY509Pct | 0 | 0.97250 |
| IRS990ScheduleA/PublicSupportPY509Pct | 0 | 0.97250 |
| IRS990ScheduleA/PublicSupportTotal509Amt | 0 | 162842 |
| IRS990ScheduleA/SubstantialContributorsAmtGrp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/TaxRevLeviedOrgnztnlBnft509Grp/TotalAmt | 0 | 0 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY509Ind | 0 | X |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearAmt | 0 | 39105 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus1YearAmt | 0 | 34890 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 31205 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 25925 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 31717 |
| IRS990ScheduleA/Total509Grp/TotalAmt | 0 | 162842 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearAmt | 0 | 39302 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus1YearAmt | 0 | 34962 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus2YearsAmt | 0 | 31267 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus3YearsAmt | 0 | 30140 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus4YearsAmt | 0 | 31783 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/TotalAmt | 0 | 167454 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | | Donee's Name: BIG MOUNTAIN FIRE DISTRICT | Description of Property: GENERATOR | Date of Gift: 20181003 | Book Value: $13134 | Method Used to Determine BV: PURCHASE | Fair Market Value: $13134 | Method Used to Determine FMV: PURCHASE |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | Advertising and Promotion $81 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | Office Expenses $15 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | ANNUAL REPORT $20 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Grants and Similar Amounts Paid In Excess of $5,000.3 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Other Expenses.1001 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Other Expenses.1002 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Other Expenses.3 |
| ReturnHeader/BuildTS | 0 | 2019-02-21 02:37:17Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | true |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | RHONA MEISLIK |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | Treasurer |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2019-04-26 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | BIG MOUNTAIN FIREFIGHTERS ASSOCIATION |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | BIGM |
| ReturnHeader/Filer/EIN | 0 | 820534620 |
| ReturnHeader/Filer/PhoneNum | 0 | 4068620387 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | 3790 BIG MOUNTAIN ROAD |
| ReturnHeader/Filer/USAddress/CityNm | 0 | WHITEFISH |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | MT |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 59937 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmEIN | 0 | 200126304 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt | 0 | MYRA APPEL CPA LLC |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt | 0 | 61 HUMMINGBIRD LN |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm | 0 | WHITEFISH |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd | 0 | MT |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd | 0 | 59937 |
| ReturnHeader/PreparerPersonGrp/PhoneNum | 0 | 4068624057 |
| ReturnHeader/PreparerPersonGrp/PreparerPersonNm | 0 | Myra A Appel |
| ReturnHeader/PreparerPersonGrp/SelfEmployedInd | 0 | X |
| ReturnHeader/ReturnTs | 0 | 2019-04-26T14:08:19-07:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990EZ |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2018-01-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2018-12-31 |
| ReturnHeader/TaxYr | 0 | 2018 |