Debt Financing 2015 TEBS Debt Financing (Details) - USD ($)	Sep. 30, 2015	Jul. 01, 2015	Dec. 31, 2014
Available for Sale Securities at Par Value	$ 118,010,775		$ 118,342,000
TEBS III Facility [Member] [Member]
Available for Sale Securities at Par Value	105,400,000
Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member]
Available for Sale Securities at Par Value	105,336,646	$ 105,356,928
Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Vantage at Judson [Member]
Available for Sale Securities at Par Value	26,540,000	26,540,000
Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Vantage at Harlingen [Member]
Available for Sale Securities at Par Value	24,575,000	24,575,000
Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Renaissance Gateway [Member]
Available for Sale Securities at Par Value	11,475,663	11,491,928
Series A [Member] | Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Silver Moon [Member]
Available for Sale Securities at Par Value	7,995,983	8,000,000
Series A [Member] | Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Santa Fe Apts [Member]
Available for Sale Securities at Par Value	3,065,000	3,065,000
Series A [Member] | Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Montclair Apts [Member]
Available for Sale Securities at Par Value	2,530,000	2,530,000
Series A [Member] | Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Heritage Square [Member]
Available for Sale Securities at Par Value	11,185,000	11,185,000
Series A [Member] | Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Glenview Apts [Member]
Available for Sale Securities at Par Value	4,670,000	4,670,000
Series A [Member] | Mortgage revenue bonds [Member] | TEBS III Facility [Member] [Member] | Perrin Square [Member]
Available for Sale Securities at Par Value	$ 13,300,000	$ 13,300,000