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Interest Rate Derivative Agreements (Details) (USD $)
9 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2010
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Derivative [Line Items]        
Derivative, Fixed Interest Rate       3.00%us-gaap_DerivativeFixedInterestRate
Bank of New York Mellon [Member]        
Derivative [Line Items]        
Derivative, Purchase Date Sep. 02, 2010      
Notional Amount of Interest Rate Derivatives   $ 31,936,667invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_BankOfNewYorkMellonMember
   
Derivative, Fixed Interest Rate   3.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_BankOfNewYorkMellonMember
   
Derivative, Maturity Date at a point in time   Sep. 01, 2017    
Deriviative at purchase price   921,000atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_BankOfNewYorkMellonMember
   
Barclays Bank PLC [Member]        
Derivative [Line Items]        
Derivative, Purchase Date Sep. 02, 2010      
Notional Amount of Interest Rate Derivatives   31,936,667invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_BarclaysBankPlcMember
   
Derivative, Fixed Interest Rate   3.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_BarclaysBankPlcMember
   
Derivative, Maturity Date at a point in time   Sep. 01, 2017    
Deriviative at purchase price   845,600atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_BarclaysBankPlcMember
   
Royal Bank of Canada [Member]        
Derivative [Line Items]        
Derivative, Purchase Date Sep. 02, 2010      
Notional Amount of Interest Rate Derivatives   31,936,667invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_RoyalBankOfCanadaMember
   
Derivative, Fixed Interest Rate   3.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_RoyalBankOfCanadaMember
   
Derivative, Maturity Date at a point in time   Sep. 01, 2017    
Deriviative at purchase price   928,000atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_RoyalBankOfCanadaMember
   
Deutsche Bank [Member]        
Derivative [Line Items]        
Derivative, Purchase Date     Aug. 15, 2013  
Notional Amount of Interest Rate Derivatives   93,305,000invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_DeutscheBankMember
   
Derivative, Fixed Interest Rate   1.50%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_DeutscheBankMember
  1.50%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_DeutscheBankMember
Derivative, Maturity Date at a point in time   Sep. 01, 2017   Sep. 01, 2017
Deriviative at purchase price   793,000atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_DeutscheBankMember
  800,000atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_DeutscheBankMember
Derivative Asset, Notional Amount       93,300,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_DeutscheBankMember
SMBC Capital Markets, Inc [Member]        
Derivative [Line Items]        
Derivative, Purchase Date     Feb. 18, 2014  
Derivative, Fixed Interest Rate     1.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsIncMember
 
Derivative, Maturity Date at a point in time     Mar. 01, 2017  
Deriviative at purchase price     230,500atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsIncMember
 
Derivative Asset, Notional Amount     41,250,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsIncMember
 
SMBC Capital Markets, Inc-2 [Member]        
Derivative [Line Items]        
Derivative, Purchase Date     Feb. 18, 2014  
Derivative, Fixed Interest Rate     1.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsInc2Member
 
Derivative, Maturity Date at a point in time     Mar. 01, 2017  
Deriviative at purchase price     161,000atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsInc2Member
 
Derivative Asset, Notional Amount     28,750,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsInc2Member
 
Barclays Bank PLC 1 [Member]        
Derivative [Line Items]        
Derivative, Purchase Date     Jul. 10, 2014  
Derivative, Fixed Interest Rate     3.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_BarclaysBankPLC1Member
 
Derivative, Maturity Date at a point in time     Aug. 15, 2019  
Deriviative at purchase price     315,200atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_BarclaysBankPLC1Member
 
Derivative Asset, Notional Amount     31,565,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_BarclaysBankPLC1Member
 
Royal Bank of Canada-2 [Member]        
Derivative [Line Items]        
Derivative, Purchase Date     Jul. 10, 2014  
Derivative, Fixed Interest Rate     3.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_RoyalBankofCanada2Member
 
Derivative, Maturity Date at a point in time     Aug. 15, 2019  
Deriviative at purchase price     343,000atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_RoyalBankofCanada2Member
 
Derivative Asset, Notional Amount     31,565,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_RoyalBankofCanada2Member
 
SMBC Capital Markets, Inc-3 [Member]        
Derivative [Line Items]        
Derivative, Purchase Date     Jul. 10, 2014  
Derivative, Fixed Interest Rate     3.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsInc3Member
 
Derivative, Maturity Date at a point in time     Aug. 15, 2019  
Deriviative at purchase price     333,200atax_DeriviativeAtPurchasePrice
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsInc3Member
 
Derivative Asset, Notional Amount     31,565,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_CounterpartyNameAxis
= atax_SMBCCapitalMarketsInc3Member