Debt Financing Footnote XBRL details (Details) (USD $)																															3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Arbors at Hickory Ridge [Member]	Dec. 31, 2012 Arbors at Hickory Ridge [Member]	Mar. 31, 2013 Greens of Pine Glen [Member]	Mar. 31, 2013 Autumn Pines [Member]	Jul. 31, 2011 Autumn Pines [Member]	Dec. 31, 2012 TOB facility-3 [Member] Integer	Mar. 31, 2013 TOB Facility-1 [Member]	Mar. 31, 2013 TOB facility-2 [Member]	Mar. 31, 2013 TEB Facility [Member] Integer	Jun. 30, 2012 TEB Facility [Member]	Dec. 31, 2010 Class A TEBS Certificates [Member] TEB Facility [Member]	Dec. 31, 2010 Class B TEBS Certificates [Member] TEB Facility [Member]	Jun. 30, 2013 Trust Portfolio--MBS Bonds [Member]	Mar. 31, 2013 Trust Portfolio--MBS Bonds [Member]	Dec. 31, 2012 Trust Portfolio--MBS Bonds [Member]	Jun. 30, 2013 Trust Portfolio--MBS Bonds [Member] SPEARS [Member]	Mar. 31, 2013 Trust Portfolio--MBS Bonds [Member] SPEARS [Member]	Dec. 31, 2012 Trust Portfolio--MBS Bonds [Member] SPEARS [Member]	Jun. 30, 2013 Trust Portfolio--MBS Bonds [Member] LIFERS [Member]	Mar. 31, 2013 Trust Portfolio--MBS Bonds [Member] LIFERS [Member]	Dec. 31, 2012 Trust Portfolio--MBS Bonds [Member] LIFERS [Member]	Mar. 31, 2013 Public housing capital fund trusts [Member]	Jun. 30, 2012 Public housing capital fund trusts [Member]	Jun. 30, 2012 Public housing capital fund trusts [Member] SPEARS [Member]	Jun. 30, 2012 Public housing capital fund trusts [Member] LIFERS [Member]	Mar. 31, 2013 Mortgage Backed Security Trust 5 [Member] [Member] Trust Portfolio--MBS Bonds [Member]	Mar. 31, 2013 Mortgage Backed Security Trust 5 [Member] [Member] Trust Portfolio--MBS Bonds [Member] SPEARS [Member]	Mar. 31, 2013 Mortgage Backed Security Trust 5 [Member] [Member] Trust Portfolio--MBS Bonds [Member] LIFERS [Member]	Mar. 31, 2013 Five Points Bank [Member]	Mar. 31, 2013 Omaha State Bank [Member]
Debt financing	$ 194,267,900	$ 177,948,000									$ 93,800,000		$ 95,800,000	$ 20,300,000
Available for Sale Securities, not Including Premiums															10,000,000	33,665,000	31,600,000	7,800,000			2,200,000			65,264,703	65,264,703
TOB Financing			7,000,000		6,000,000	9,900,000	10,000,000									2,500,000			26,700,000	24,700,000		500,000	6,500,000			49,000,000	16,000,000	2,500,000	2,000,000	500,000
Short-term Debt, Percentage Bearing Fixed Interest Rate			2.10%		2.10%
Available for Sale Securities at Par Value	123,469,840	124,648,502					13,400,000
Debt Instrument, Basis Spread on Variable Rate			0.50%		0.50%							1.90%			1.20%
Debt Instrument, Interest Rate, Stated Percentage				6.25%								0.00%																				5.00%
Debt, Weighted Average Interest Rate			2.60%		2.60%				1.20%	2.30%		2.00%			3.90%
Number of Available for Sale Securities, Held in a Trust								5			13
Line of Credit Facility, Maximum Borrowing Capacity																															10,000,000	6,000,000
Line of Credit Facility, Interest Rate During Period																															3.50%
Line of Credit Facility, Amount Outstanding																															$ 2,000,000	$ 100,000
Long Term Debt, Maturity date at a point in time																																Jan. 25, 2014