2.4.0.8040290 - Disclosure - Variable Interest Entities - VIE Income Statement (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$FROM_Apr01_2013_TO_Jun30_2013_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_VariableInterestEntityPrimaryBeneficiaryMemberhttp://www.sec.gov/CIK0001275477duration2013-04-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$FROM_Jan01_2013_TO_Jun30_2013_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_VariableInterestEntityPrimaryBeneficiaryMemberhttp://www.sec.gov/CIK0001275477duration2013-01-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse1false USDtruefalse$FROM_Apr01_2013_TO_Jun30_2013_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_VariableInterestEntityPrimaryBeneficiaryMemberhttp://www.sec.gov/CIK0001275477duration2013-04-01T00:00:002013-06-30T00:00:00falsefalse[VariableInterestEntityPrimaryBeneficiaryMember]us-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0[VariableInterestEntityPrimaryBeneficiaryMember]2true 4bmnm_PortfolioIncomeAbstractbmnm_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Portfolio Income [Abstract]3false 5bmnm_InterestIncomeViebmnm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse24290002429USD$falsetruefalse2truefalsefalse34600003460USD$falsetruefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest income4false 5bmnm_InterestExpenseViebmnm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse322000322USD$falsefalsefalse2truefalsefalse459000459USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest expense5false 5bmnm_NetInterestIncomeViebmnm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse21070002107USD$falsefalsefalse2truefalsefalse30010003001USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Net interest income6false 5bmnm_UnrealizedGainsViebmnm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsepositiveVerboseLabel1truefalsefalse-9130000-9130USD$falsefalsefalse2truefalsefalse-8618000-8618USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Unrealized gains on mortgage-backed securities7false 5bmnm_RealizedGainsViebmnm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse-923000-923USD$falsefalsefalse2truefalsefalse-824000-824USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Realized gains on mortgage-backed securities8false 5bmnm_EurodollarGainsViebmnm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse68520006852USD$falsefalsefalse2truefalsefalse63680006368USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Losses on Eurodollar futures9false 5bmnm_PortfolioIncomeViebmnm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-1094000-1094USD$falsefalsefalse2truefalsefalse-73000-73USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Net portfolio income10true 4us-gaap_SellingGeneralAndAdministrativeExpenseAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Selling General And Administrative Expense [Abstract]11false 5bmnm_DirectorsFeesViebmnm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse8300083USD$falsefalsefalse2truefalsefalse124000124USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Directors' fees and liability insurance12false 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5bmnm_TotalExpensesViebmnm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse266000266USD$falsefalsefalse2truefalsefalse403000403USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total expenses16false 4bmnm_NetIncomeViebmnm_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-1360000-1360USD$falsetruefalse2truefalsefalse-476000-476USD$falsetruefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Net incomefalseVariable Interest Entities - VIE Income Statement (Details) ([VariableInterestEntityPrimaryBeneficiaryMember], USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.biminicapital.com/role/VariableInterestEntitiesVIEIncomeStatementDetails216