Public Housing Capital Fund Trusts Narrative Tagging (Details) (USD $)	3 Months Ended					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Public housing capital fund trusts [Member]	Dec. 31, 2012 Public housing capital fund trusts [Member] Integer	Jun. 30, 2012 Public housing capital fund trusts [Member] Integer	Jun. 30, 2012 LIFERS [Member]	Jun. 30, 2012 LIFERS [Member] Public housing capital fund trusts [Member]	Mar. 31, 2013 Effective rate - minimum [Member]	Dec. 31, 2012 Effective rate - minimum [Member]	Mar. 31, 2013 Effective rate - minimum [Member] Public housing capital fund trusts [Member]	Dec. 31, 2012 Effective rate - minimum [Member] Public housing capital fund trusts [Member]	Mar. 31, 2013 Effective rate - maximum [Member]	Dec. 31, 2012 Effective rate - maximum [Member]	Mar. 31, 2013 Effective rate - maximum [Member] Public housing capital fund trusts [Member]	Dec. 31, 2012 Effective rate - maximum [Member] Public housing capital fund trusts [Member]	Mar. 31, 2013 10% adverse [Member] Public housing capital fund trusts [Member]	Mar. 31, 2013 10% adverse [Member] Effective rate - minimum [Member]	Mar. 31, 2013 10% adverse [Member] Effective rate - minimum [Member] Public housing capital fund trusts [Member]	Mar. 31, 2013 10% adverse [Member] Effective rate - maximum [Member]	Mar. 31, 2013 10% adverse [Member] Effective rate - maximum [Member] Public housing capital fund trusts [Member]
Schedule of Available-for-sale Securities [Line Items]
TOB Financing							$ 16,000,000
Number of Available for Sale Securities, Public Housing Authorities				3	3
Available for Sale Securities, not Including Premiums			65,264,703		65,264,703
Available-for-Sale Securities, Ownership Percentage	100.00%					100.00%
Effective rate								5.50%	5.70%	4.80%	4.60%	8.30%	8.40%	6.00%	5.90%		6.00%	5.20%	9.10%	6.60%
Adverse change rate	10.00%
Available-for-sale Securities, Gross Unrealized Losses	$ 4,180,745	$ 4,289,886														$ 2,900,000