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Fair Value Measurements Available for sale securities (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure       $ 243,126,815
Total gains (lossses) (realized/unrealized) [Abstract]        
Tax-exempt mortgage revenue bonds held in trust, at fair value 130,391,760     99,534,082
Assets, Fair Value Disclosure 305,862,287     243,126,815
Tax-exempt mortgage revenue bonds [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure       145,237,376
Total gains (lossses) (realized/unrealized) [Abstract]        
Assets, Fair Value Disclosure 206,859,175     145,237,376
Public housing capital fund trusts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure       65,389,298
Total gains (lossses) (realized/unrealized) [Abstract]        
Assets, Fair Value Disclosure 64,613,713     65,389,298
Trust Portfolio--MBS Bonds [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Equity Method Investment, Quoted Market Value 0     0
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure       32,121,412
Total gains (lossses) (realized/unrealized) [Abstract]        
Assets, Fair Value Disclosure 34,115,328     32,121,412
Fair Value Observable inputs (level 2) 34,115,328     32,121,412
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0     0
Interest rate derivatives [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure       378,729
Total gains (lossses) (realized/unrealized) [Abstract]        
Assets, Fair Value Disclosure 274,071     378,729
Fair Value, Inputs, Level 3 [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure 211,005,403 139,570,108 137,018,622  
Total gains (lossses) (realized/unrealized) [Abstract]        
Gain (Loss) on Investments (104,658) (104,658) (329,340)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 2,867,419   2,841,588  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 38,400,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2,371)   39,238  
Assets, Fair Value Disclosure 271,746,959   139,570,108  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 271,746,959     211,005,403
Fair Value, Inputs, Level 3 [Member] | Tax-exempt mortgage revenue bonds [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure 145,237,376 138,576,178 135,695,352  
Total gains (lossses) (realized/unrealized) [Abstract]        
Gain (Loss) on Investments 0 0 0  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 3,628,875   2,841,588  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 38,400,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 11,758   39,238  
Assets, Fair Value Disclosure 206,859,175   138,576,178  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 206,859,175     145,237,376
Fair Value, Inputs, Level 3 [Member] | Public housing capital fund trusts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure 65,389,298 0 0  
Total gains (lossses) (realized/unrealized) [Abstract]        
Gain (Loss) on Investments 0    0  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities (761,456)   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (14,129)   0  
Assets, Fair Value Disclosure 64,613,713   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 64,613,713     65,389,298
Fair Value, Inputs, Level 3 [Member] | Interest rate derivatives [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Assets, Fair Value Disclosure 378,729 993,930 1,323,270  
Total gains (lossses) (realized/unrealized) [Abstract]        
Gain (Loss) on Investments (104,658) (104,658) (329,340)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities 0   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0   0  
Assets, Fair Value Disclosure 274,071   993,930  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 274,071     378,729
Fair Value, Inputs, Level 1 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Equity Method Investment, Quoted Market Value 0     0
Fair Value, Inputs, Level 1 [Member] | Tax-exempt mortgage revenue bonds [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Equity Method Investment, Quoted Market Value 0     0
Fair Value, Inputs, Level 1 [Member] | Public housing capital fund trusts [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Equity Method Investment, Quoted Market Value 0     0
Fair Value, Inputs, Level 1 [Member] | Interest rate derivatives [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Equity Method Investment, Quoted Market Value 0     0
Fair Value, Inputs, Level 2 [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Fair Value Observable inputs (level 2) 34,115,328     32,121,412
Fair Value, Inputs, Level 2 [Member] | Tax-exempt mortgage revenue bonds [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Fair Value Observable inputs (level 2) 0     0
Fair Value, Inputs, Level 2 [Member] | Public housing capital fund trusts [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Fair Value Observable inputs (level 2) 0     0
Fair Value, Inputs, Level 2 [Member] | Interest rate derivatives [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Fair Value Observable inputs (level 2) 0     0
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Tax-exempt mortgage revenue bonds held in trust, at fair value 19,581,166      
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member] | Tax-exempt mortgage revenue bonds [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Tax-exempt mortgage revenue bonds held in trust, at fair value 19,581,166      
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member] | Public housing capital fund trusts [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Tax-exempt mortgage revenue bonds held in trust, at fair value 0      
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate derivatives [Member]
       
Total gains (lossses) (realized/unrealized) [Abstract]        
Tax-exempt mortgage revenue bonds held in trust, at fair value $ 0