Segment Reporting Segment Reporting (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues [Abstract]
Revenues	$ 12,526,708	$ 11,842,949	$ 11,252,978	$ 13,200,840	$ 9,432,691	$ 9,764,177	$ 15,140,583	$ 12,944,409	$ 48,823,475	$ 47,281,860	$ 25,119,651
Interest Expense [Abstract]
Interest expense									11,398,649	7,235,336	5,530,995
Depreciation [Abstract]
Depreciation									5,741,590	5,171,703	4,029,711
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									15,029,188	14,534,438	2,763,762
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	2,020,746	3,307,829	3,658,457	6,046,829	2,027,074	3,411,259	3,955,160	8,321,426	15,033,861	17,714,919	4,446,844
Assets [Abstract]
Assets	744,239,217				534,233,032				744,239,217	534,233,032	413,150,755
Partners' Capital
Partners' Capital	309,943,899				203,134,087				309,943,899	203,134,087	181,917,192
Available-for-sale Securities [Member]
Revenues [Abstract]
Revenues									27,858,725	27,766,013	12,169,336
Interest Expense [Abstract]
Interest expense									7,379,830	3,327,231	3,510,182
Depreciation [Abstract]
Depreciation									0	0	0
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									13,870,294	14,491,581	4,136,126
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									13,870,294	14,491,581	4,136,126
Assets [Abstract]
Assets	698,637,412				442,175,645				698,637,412	442,175,645	357,606,420
Partners' Capital
Partners' Capital	355,480,225				231,042,138				355,480,225	231,042,138	221,665,286
MF Properties [Member]
Revenues [Abstract]
Revenues									14,250,572	11,358,719	7,846,813
Interest Expense [Abstract]
Interest expense									2,319,928	2,152,010	1,439,370
Depreciation [Abstract]
Depreciation									4,801,533	3,804,499	2,485,365
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(938,151)	(1,837,076)	(1,065,819)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									(933,478)	1,343,405	617,263
Assets [Abstract]
Assets	101,696,234				83,580,479				101,696,234	83,580,479	51,379,479
Partners' Capital
Partners' Capital	18,600,449				23,107,538				18,600,449	23,107,538	6,643,315
Public Housing Capital Fund Trust Certificates [Member]
Revenues [Abstract]
Revenues									3,038,819	3,261,611	1,624,534
Interest Expense [Abstract]
Interest expense									1,295,238	1,292,540	542,479
Depreciation [Abstract]
Depreciation									0	0	0
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									1,714,968	1,940,459	1,067,749
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									1,714,968	1,940,459	1,067,749
Assets [Abstract]
Assets	61,577,848				62,449,028				61,577,848	62,449,028	65,811,361
Partners' Capital
Partners' Capital	16,803,457				13,336,761				16,803,457	13,336,761	16,720,915
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Revenues [Abstract]
Revenues									1,423,958	1,601,270	194,039
Interest Expense [Abstract]
Interest expense									403,653	463,555	38,964
Depreciation [Abstract]
Depreciation									0	0	0
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									1,017,637	1,055,736	148,552
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									1,017,637	1,055,736	148,552
Assets [Abstract]
Assets	15,101,309				38,427,654				15,101,309	38,427,654	32,488,363
Partners' Capital
Partners' Capital	3,095,526				4,397,356				3,095,526	4,397,356	7,334,399
Segment, Discontinued Operations [Member]
Assets [Abstract]
Assets	0				0				0	0	32,580,427
Consolidated VIEs [Member]
Revenues [Abstract]
Revenues									3,180,680	13,938,850	4,805,746
Interest Expense [Abstract]
Interest expense									2,254,786	3,221,000	3,240,306
Depreciation [Abstract]
Depreciation									940,057	1,367,204	1,544,346
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(1,987,839)	6,265,571	(3,285,896)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									(1,987,839)	6,265,571	(3,285,896)
Assets [Abstract]
Assets	13,456,861				14,019,837				13,456,861	14,019,837	30,207,191
Partners' Capital
Partners' Capital	(23,499,616)				(21,511,776)				(23,499,616)	(21,511,776)	(22,480,214)
Consolidation, Eliminations [Member]
Revenues [Abstract]
Revenues									(929,279)	(10,644,603)	(1,520,817)
Interest Expense [Abstract]
Interest expense									(2,254,786)	(3,221,000)	(3,240,306)
Depreciation [Abstract]
Depreciation									0	0	0
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									1,352,279	(7,381,833)	1,763,050
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									1,352,279	(7,381,833)	1,763,050
Assets [Abstract]
Assets	(146,230,447)				(106,419,611)				(146,230,447)	(106,419,611)	(156,922,486)
Partners' Capital
Partners' Capital	$ (60,536,142)				$ (47,237,930)				$ (60,536,142)	$ (47,237,930)	$ (47,966,509)