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MBS Investments Carrying Value of Asset (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 65,538,068us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 71,040,881us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gain 5,082,559us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 340,453us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Available-for-sale Securities, Gross Unrealized Losses (19,582)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss 2,434,964us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Mortgage backed securities, at fair value 14,841,558atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities 37,845,661atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities
Trust Portfolio--MBS Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 15,367,641us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
43,801,816us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Unrealized Gain 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Available-for-sale Securities, Gross Unrealized Losses (526,083)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
(5,956,155)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Mortgage backed securities, at fair value 14,841,558atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
37,845,661atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Trust Portfolio--MBS Bonds [Member] | Standard & Poor's, AAA Rating [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Debt Instrument, Credit Rating "AAA" [1] “AAA” [1]
Available-for-sale Securities, Amortized Cost Basis 5,304,974us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
23,177,115us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Unrealized Gain    0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Available-for-sale Securities, Gross Unrealized Losses (250,624)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
(3,069,555)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Mortgage backed securities, at fair value 5,054,350atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
20,107,560atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Trust Portfolio--MBS Bonds [Member] | Standard & Poor's, AA Rating [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Debt Instrument, Credit Rating "AA" [1] “AA” [1]
Available-for-sale Securities, Amortized Cost Basis 10,062,667us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
20,624,701us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Unrealized Gain    0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Available-for-sale Securities, Gross Unrealized Losses (275,459)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
(2,886,600)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
Mortgage backed securities, at fair value $ 9,787,208atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
$ 17,738,101atax_AvailableForSaleSecuritiesFairValueDisclosureMortgageBackedSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
/ us-gaap_StatementBusinessSegmentsAxis
= atax_TrustPortfolioMbsBondsMember
[1] (1) MBS are reported based on the lowest rating issued by a Rating Agency, if more than one rating is issued on the security, at the date presented.