Segment Reporting Segment Reporting (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues [Abstract]
Revenues	$ 9,432,691	$ 9,764,177	$ 15,140,583	$ 12,944,409	$ 7,579,754	$ 6,312,905	$ 5,855,843	$ 5,371,149	$ 47,281,860	$ 25,119,651	$ 21,698,795
Interest Expense [Abstract]
Interest expense									7,235,336	5,530,995	5,441,700
Depreciation [Abstract]
Depreciation									5,171,703	4,029,711	3,135,155
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									14,534,438	2,763,762	(2,425,355)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	2,027,074	3,411,259	3,955,160	8,321,426	1,298,797	2,211,567	306,048	630,432	17,714,919	4,446,844	(2,243,922)
Assets [Abstract]
Assets	534,233,032				413,150,755				534,233,032	413,150,755	297,976,545
Partners' Capital
Partners' Capital	203,134,087				181,917,192				203,134,087	181,917,192	131,044,260
Available-for-sale Securities [Member]
Revenues [Abstract]
Revenues									27,766,013	12,169,336	12,635,513
Interest Expense [Abstract]
Interest expense									3,327,231	3,510,182	4,463,926
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									14,491,581	4,136,126	(353,323)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									14,491,581	4,136,126	(353,323)
Assets [Abstract]
Assets	442,175,645				357,606,420				442,175,645	357,606,420	321,433,013
Partners' Capital
Partners' Capital	231,042,138				221,665,286				231,042,138	221,665,286	179,285,257
MF Properties [Member]
Revenues [Abstract]
Revenues									11,358,719	7,846,813	5,066,443
Interest Expense [Abstract]
Interest expense									2,152,010	1,439,370	977,774
Depreciation [Abstract]
Depreciation									3,804,499	2,485,365	1,451,875
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(1,837,076)	(1,065,819)	(782,493)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									1,343,405	617,263	(601,060)
Assets [Abstract]
Assets	83,580,479				51,379,479				83,580,479	51,379,479	43,926,832
Partners' Capital
Partners' Capital	23,107,538				6,643,315				23,107,538	6,643,315	2,394,991
Public Housing Capital Fund Trust Certificates [Member]
Revenues [Abstract]
Revenues									3,261,611	1,624,534	0
Interest Expense [Abstract]
Interest expense									1,292,540	542,479	0
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									1,940,459	1,067,749	0
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									1,940,459	1,067,749	0
Assets [Abstract]
Assets	62,449,028				65,811,361				62,449,028	65,811,361	0
Partners' Capital
Partners' Capital	13,336,761				16,720,915				13,336,761	16,720,915	0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Revenues [Abstract]
Revenues									1,601,270	194,039	0
Interest Expense [Abstract]
Interest expense									463,555	38,964	0
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									1,055,736	148,552	0
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									1,055,736	148,552	0
Assets [Abstract]
Assets	38,427,654				32,488,363				38,427,654	32,488,363	0
Partners' Capital
Partners' Capital	4,397,356				7,334,399				4,397,356	7,334,399	0
Segment, Discontinued Operations [Member]
Assets [Abstract]
Assets	0				32,580,427				0	32,580,427	37,494,700
Consolidated VIEs [Member]
Revenues [Abstract]
Revenues									13,938,850	4,805,746	10,043,284
Interest Expense [Abstract]
Interest expense									3,221,000	3,240,306	4,037,725
Depreciation [Abstract]
Depreciation									1,367,204	1,544,346	1,683,280
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									6,265,571	(3,285,896)	682,243
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									6,265,571	(3,285,896)	682,243
Assets [Abstract]
Assets	14,019,837				30,207,191				14,019,837	30,207,191	24,315,353
Partners' Capital
Partners' Capital	(21,511,776)				(22,480,214)				(21,511,776)	(22,480,214)	(24,872,428)
Consolidation, Eliminations [Member]
Revenues [Abstract]
Revenues									(10,644,603)	(1,520,817)	(6,046,445)
Interest Expense [Abstract]
Interest expense									(3,221,000)	(3,240,306)	(4,037,725)
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									(7,381,833)	1,763,050	(1,971,782)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)									(7,381,833)	1,763,050	(1,971,782)
Assets [Abstract]
Assets	(106,419,611)				(156,922,486)				(106,419,611)	(156,922,486)	(129,193,353)
Partners' Capital
Partners' Capital	$ (47,237,930)				$ (47,966,509)				$ (47,237,930)	$ (47,966,509)	$ (25,763,560)