Segment Reporting Segment Reporting (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 22,402,643		$ 22,402,643		$ 19,817,998
Revenues [Abstract]
Revenues	7,145,827	6,587,889	13,795,505	12,625,716
Interest Expense [Abstract]
Interest expense	1,546,688	1,630,527	2,865,223	2,404,261
Depreciation [Abstract]
Depreciation	1,339,238	1,146,692	2,584,646	2,132,007
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	338,153	(121,191)	1,061,703	1,236,040
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	306,048	(243,248)	936,480	945,926
Assets [Abstract]
Assets	353,146,684		353,146,684		297,976,545
Partners' Capital
Partners' Capital	189,485,138		189,485,138		131,044,260
Tax-exempt bond investments [Member]
Revenues [Abstract]
Revenues	3,380,596	3,124,811	6,173,018	6,175,858
Interest Expense [Abstract]
Interest expense	1,057,792	1,349,496	1,965,313	2,097,826
Depreciation [Abstract]
Depreciation	0	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	896,430	282,449	1,749,431	1,796,292
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	896,430	261,345	1,749,431	1,796,292
Assets [Abstract]
Assets	369,314,798		369,314,798		321,433,014
Partners' Capital
Partners' Capital	231,866,117		231,866,117		179,285,257
MF Properties [Member]
Revenues [Abstract]
Revenues	2,946,188	2,370,540	5,990,208	4,049,855
Interest Expense [Abstract]
Interest expense	488,896	281,031	899,910	306,435
Depreciation [Abstract]
Depreciation	990,069	682,268	1,888,005	1,134,108
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(299,268)	13,282	(188,860)	136,799
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	(331,373)	(87,671)	(314,083)	(153,315)
Assets [Abstract]
Assets	82,247,442		82,247,442		81,421,531
Partners' Capital
Partners' Capital	2,373,086		2,373,086		2,279,639
Consolidated VIEs [Member]
Segment Reporting Information [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	13,028,974		13,028,974		12,332,334
Revenues [Abstract]
Revenues	1,199,745	2,377,204	2,394,654	7,680,280
Interest Expense [Abstract]
Interest expense	803,693	1,130,108	1,602,835	2,454,406
Depreciation [Abstract]
Depreciation	349,169	464,424	696,641	997,899
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(692,904)	(267,577)	(1,361,164)	2,110,351
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	(692,904)	(267,577)	(1,361,164)	2,110,351
Assets [Abstract]
Assets	23,814,268		23,814,268		24,315,353
Partners' Capital
Partners' Capital	(26,233,590)		(26,233,590)		(24,872,428)
Consolidation, Eliminations [Member]
Revenues [Abstract]
Revenues	(380,702)	(1,284,666)	(762,375)	(5,280,277)
Interest Expense [Abstract]
Interest expense	(803,693)	(1,130,108)	(1,602,835)	(2,454,406)
Depreciation [Abstract]
Depreciation	0	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	433,895	(149,345)	862,296	(2,807,402)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	433,895	(149,345)	862,296	(2,807,402)
Assets [Abstract]
Assets	(122,229,824)		(122,229,824)		(129,193,353)
Partners' Capital
Partners' Capital	$ (18,520,475)		$ (18,520,475)		$ (25,648,208)