Debt Financing 2014 TEBS Financing (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Available for Sale Securities at Par Value, held in trust	$ 118,010,775	$ 118,342,000
Mortgage revenue bonds [Member] | Arbors at Hickory Ridge [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	11,450,000	11,450,000
Mortgage revenue bonds [Member] | Copper Gate [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	5,220,000	5,220,000
Mortgage revenue bonds [Member] | The Palms at Premier Park [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	20,043,237	20,152,000
Series A [Member] | Mortgage revenue bonds [Member] | Avistar at Chase Hill [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	9,957,357	10,000,000
Series A [Member] | Mortgage revenue bonds [Member] | Avistar at the Crest [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	9,658,636	9,700,000
Series A [Member] | Mortgage revenue bonds [Member] | Avistar at the Oaks [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	7,794,525	7,800,000
Series A [Member] | Mortgage revenue bonds [Member] | Avistar in 09 [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	6,730,273	6,735,000
Series A [Member] | Mortgage revenue bonds [Member] | Avistar on the Boulevard [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	16,454,530	16,525,000
Series A [Member] | Mortgage revenue bonds [Member] | Avistar on the Hills [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	5,385,217	5,389,000
Series A [Member] | Mortgage revenue bonds [Member] | Greens of Pine Glen [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	8,312,000	8,366,000
Series A [Member] | Mortgage revenue bonds [Member] | Harden Ranch [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	6,960,000	6,960,000
Series A [Member] | Mortgage revenue bonds [Member] | Tyler Park Apartments [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	6,075,000	6,075,000
Series A [Member] | Mortgage revenue bonds [Member] | Westside Village Market [Member] | TEBS II Facility [Member]
Available for Sale Securities at Par Value, held in trust	$ 3,970,000	$ 3,970,000