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DERIVATIVE INSTRUMENTS HEDGING AND NON-HEDGING ACTIVITIES (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair value $ 0us-gaap_DerivativeAssets $ 21,550us-gaap_DerivativeAssets
Derivative Assets, Notional Amount 0us-gaap_DerivativeAssetNotionalAmount 25,000,000us-gaap_DerivativeAssetNotionalAmount
Derivative Liabilities, Fair value (4,102,546)us-gaap_DerivativeLiabilities (2,289,058)us-gaap_DerivativeLiabilities
Derivative Liabilities, Notional Amount 273,000,000us-gaap_DerivativeLiabilityNotionalAmount 324,000,000us-gaap_DerivativeLiabilityNotionalAmount
Interest rate swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair value 0us-gaap_DerivativeAssets
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
0us-gaap_DerivativeAssets
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
Derivative Assets, Notional Amount 0us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
0us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
Derivative Liabilities, Fair value (3,627,780)us-gaap_DerivativeLiabilities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
(1,755,107)us-gaap_DerivativeLiabilities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
Derivative Liabilities, Notional Amount 226,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
226,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_InterestRateSwapMember
Swaptions [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair value   21,550us-gaap_DerivativeAssets
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SwaptionMember
Derivative Assets, Notional Amount   25,000,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SwaptionMember
Derivative Liabilities, Fair value   0us-gaap_DerivativeLiabilities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SwaptionMember
Derivative Liabilities, Notional Amount   0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_SwaptionMember
Futures [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair value 0us-gaap_DerivativeAssets
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember
0us-gaap_DerivativeAssets
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember
Derivative Assets, Notional Amount 0us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember
0us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember
Derivative Liabilities, Fair value (474,766)us-gaap_DerivativeLiabilities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember
(533,951)us-gaap_DerivativeLiabilities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember
Derivative Liabilities, Notional Amount $ 47,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember
$ 98,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_FuturesMember