Segment Reporting Segment Reporting (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012	Dec. 31, 2012
Revenues [Abstract]
Revenues	$ 12,944,409	$ 5,371,149	$ 5,371,149
Interest Expense [Abstract]
Interest expense	1,536,273	1,268,816	1,268,816
Depreciation [Abstract]
Depreciation	1,194,628		880,006
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	6,561,058		534,436
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	8,321,426	630,432	630,432
Assets [Abstract]
Assets	442,046,482			413,150,755
Partners' Capital
Partners' Capital	189,044,982		189,044,982	181,917,192
Tax-exempt bond investments [Member]
Revenues [Abstract]
Revenues	8,443,527		2,792,422
Interest Expense [Abstract]
Interest expense	658,497		907,520
Depreciation [Abstract]
Depreciation	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	6,421,412		853,002
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	6,421,412		853,002
Assets [Abstract]
Assets	371,418,912			357,606,420
Partners' Capital
Partners' Capital	220,926,351			221,665,286
MF Properties [Member]
Revenues [Abstract]
Revenues	2,519,739		1,765,491
Interest Expense [Abstract]
Interest expense	503,005		361,296
Depreciation [Abstract]
Depreciation	849,320		532,534
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(364,494)		(78,707)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	1,395,874		17,289
Assets [Abstract]
Assets	54,377,118			51,379,479
Partners' Capital
Partners' Capital	3,890,769			6,643,315
Public Housing Capital Fund Trust Certificates [Member]
Revenues [Abstract]
Revenues	815,429		0
Interest Expense [Abstract]
Interest expense	277,860		0
Depreciation [Abstract]
Depreciation	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	530,458		0
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	530,458		0
Assets [Abstract]
Assets	65,140,026			65,811,361
Partners' Capital
Partners' Capital	16,049,319			16,720,915
Residential Mortgage Backed Securities [Member]
Revenues [Abstract]
Revenues	330,354		0
Interest Expense [Abstract]
Interest expense	96,911		0
Depreciation [Abstract]
Depreciation	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	214,641		0
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	214,641		0
Assets [Abstract]
Assets	34,536,174			32,488,363
Partners' Capital
Partners' Capital	7,713,076			7,334,399
Segment, Discontinued Operations [Member]
Assets [Abstract]
Assets	9,963,239			32,580,427
Consolidated VIEs [Member]
Revenues [Abstract]
Revenues	1,213,069	1,194,909	1,194,909
Interest Expense [Abstract]
Interest expense	819,163	799,142	799,142
Depreciation [Abstract]
Depreciation	345,308		347,472
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(693,232)		(668,260)
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	(693,232)	(668,260)	(668,260)
Assets [Abstract]
Assets	22,835,453			30,207,191
Partners' Capital
Partners' Capital	(28,470,580)			(22,480,214)
Consolidation, Eliminations [Member]
Revenues [Abstract]
Revenues	(377,709)		(381,673)
Interest Expense [Abstract]
Interest expense	(819,163)		(799,142)
Depreciation [Abstract]
Depreciation	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	452,273		428,401
Net Income (Loss) Attributable to Parent [Abstract]
Operating Income (Loss)	452,273		428,401
Assets [Abstract]
Assets	(116,224,440)			(156,922,486)
Partners' Capital
Partners' Capital	$ (31,063,953)			$ (47,966,509)