Fair Value Measurements Available for sale securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value Disclosure	$ 244,651,688	$ 137,793,568
Total gains (lossses) (realized/unrealized) [Abstract]
Gain (Loss) on Investments	0	680,444	0
Available-for-sale Securities, Fair Value Disclosure Held in Trust	216,371,801	99,534,082
Deconsolidation of VIE	2,146,974	0	1,861,051
Gain on sale and retirement of bonds	0	680,444	445,257
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	2,764,286	970,298	1,023,709
Available-for-sale Securities	68,946,370	45,703,294
Foreclosure of Available-for-Sale Securities	(4,080,734)
Assets, Fair Value Disclosure	390,184,284	244,651,688	137,793,568
Available-for-sale Securities [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Assets, Fair Value Disclosure	285,318,171	145,237,376	135,695,352
Public housing capital fund trusts [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Assets, Fair Value Disclosure	62,056,379	65,389,298
Trust Portfolio--MBS Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Assets, Fair Value Disclosure	37,845,661	32,121,412
Taxable Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Assets, Fair Value Disclosure	4,075,953	1,524,873	774,946
Interest rate derivatives [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Assets, Fair Value Disclosure	888,120	378,729	1,323,270
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	212,530,276	137,793,568	104,177,883
Total gains (lossses) (realized/unrealized) [Abstract]
Gain (Loss) on Investments	(283,610)	(944,541)	(2,083,521)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities	(21,519,908)	7,479,151	9,734,259
Deconsolidation of VIE	8,795,630		15,083,757
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	151,542,000	99,580,757	20,163,742
Gain on sale and retirement of bonds			(8,726,619)
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities		(30,654,939)
Deriviative at purchase price	793,001
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(930,817)	(723,720)	(555,933)
Assets, Fair Value Disclosure	352,338,623	212,530,276	137,793,568
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	352,338,623	212,530,276	137,793,568
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value Disclosure	145,237,376	135,695,352	100,566,643
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	(18,011,590)	8,070,888	9,734,259
Deconsolidation of VIE	8,795,630		15,083,757
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	148,624,000	32,660,864	20,117,500
Gain on sale and retirement of bonds			(9,526,619)
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities		(30,654,939)
Deriviative at purchase price	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(739,296)	(534,789)	(280,188)
Assets, Fair Value Disclosure	285,318,171	145,237,376	135,695,352
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	285,318,171	145,237,376	135,695,352
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
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	(3,276,398)	(568,335)
Deconsolidation of VIE	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	65,985,893
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities		0
Deriviative at purchase price	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(56,521)	(28,260)
Assets, Fair Value Disclosure	62,056,379	65,389,298
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	62,056,379	65,389,298
Fair Value, Inputs, Level 3 [Member] | Trust Portfolio--MBS Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0	0
Fair Value, Inputs, Level 3 [Member] | Taxable Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring/Nonrecurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value Disclosure	1,524,873	774,946	204,449
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	(231,920)	(23,402)	0
Deconsolidation of VIE	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	2,918,000	934,000	46,242
Gain on sale and retirement of bonds			800,000
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities		0
Deriviative at purchase price	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(135,000)	(160,671)	(275,745)
Assets, Fair Value Disclosure	4,075,953	1,524,873	774,946
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	4,075,953	1,524,873	774,946
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	1,323,270	3,406,791
Total gains (lossses) (realized/unrealized) [Abstract]
Gain (Loss) on Investments	(283,610)	(944,541)	(2,083,521)
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	0
Deconsolidation of VIE	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0
Gain on sale and retirement of bonds			0
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities		0
Deriviative at purchase price	793,001
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0
Assets, Fair Value Disclosure	888,120	378,729	1,323,270
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	888,120	378,729	1,323,270
Fair Value, Inputs, Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Method Investment, Quoted Market Value	0	0	0
Fair Value, Inputs, Level 1 [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Method Investment, Quoted Market Value	0	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] | Trust Portfolio--MBS Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Method Investment, Quoted Market Value	0	0
Fair Value, Inputs, Level 1 [Member] | Taxable Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity Method Investment, Quoted Market Value	0	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	0
Fair Value, Inputs, Level 2 [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Fair Value Observable inputs (level 2)	37,845,661	32,121,412	0
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Fair Value Observable inputs (level 2)	0	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] | Trust Portfolio--MBS Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Fair Value Observable inputs (level 2)	37,845,661	32,121,412
Fair Value, Inputs, Level 2 [Member] | Taxable Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Fair Value Observable inputs (level 2)	0	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	0
Greens of Pine Glen [Member] | Fair Value, Inputs, Level 3 [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	9,465,000
Greens of Pine Glen [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	9,465,000
Greens of Pine Glen [Member] | Fair Value, Inputs, Level 3 [Member] | Public housing capital fund trusts [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	0
Greens of Pine Glen [Member] | Fair Value, Inputs, Level 3 [Member] | Taxable Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	0
Greens of Pine Glen [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate derivatives [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	0
Iona Lakes [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities		16,089,910
Iona Lakes [Member] | Fair Value, Inputs, Level 3 [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities	(16,052,849)
Iona Lakes [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities	(16,052,849)
Iona Lakes [Member] | Fair Value, Inputs, Level 3 [Member] | Public housing capital fund trusts [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities	0
Iona Lakes [Member] | Fair Value, Inputs, Level 3 [Member] | Taxable Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities	0
Iona Lakes [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate derivatives [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities	0
Woodland Park [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities		11,372,961
Woodland Park [Member] | Fair Value, Inputs, Level 3 [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Foreclosure of Available-for-Sale Securities	(11,581,266)
Woodland Park [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Foreclosure of Available-for-Sale Securities	(11,581,266)
Woodland Park [Member] | Fair Value, Inputs, Level 3 [Member] | Public housing capital fund trusts [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Foreclosure of Available-for-Sale Securities	0
Woodland Park [Member] | Fair Value, Inputs, Level 3 [Member] | Taxable Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Foreclosure of Available-for-Sale Securities	0
Woodland Park [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate derivatives [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Foreclosure of Available-for-Sale Securities	0
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	19,581,166
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	19,581,166
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member] | Public housing capital fund trusts [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	0
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member] | Taxable Bonds [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	0
Ohio Properties [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate derivatives [Member]
Total gains (lossses) (realized/unrealized) [Abstract]
Available-for-sale Securities, Fair Value Disclosure Held in Trust	$ 0