Segment Reporting Segment Reporting (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Revenues [Abstract]
Total revenues	$ 16,234,300	$ 14,933,121	$ 32,274,688	$ 29,852,980
Interest Expense [Abstract]
Interest expense	5,841,327	4,322,054	11,283,580	9,092,189
Depreciation [Abstract]
Depreciation expense	1,265,335	1,649,891	2,620,566	3,296,122
Partnership net income (loss) [Abstract]
Operating Income (Loss)	4,109,400	11,005,930	11,398,262	13,537,630
Assets
Total assets	1,024,826,768		1,024,826,768		$ 944,113,674
Mortgage Revenue Bond Investments Segment [Member]
Revenues [Abstract]
Total revenues	11,059,940	8,790,823	21,648,438	17,569,877
Interest Expense [Abstract]
Interest expense	4,938,029	3,391,149	9,509,484	7,175,539
Partnership net income (loss) [Abstract]
Operating Income (Loss)	2,592,768	2,220,723	4,821,821	4,251,016
Assets
Total assets	862,988,147		862,988,147		764,995,675
MF Properties [Member]
Revenues [Abstract]
Total revenues	3,306,722	4,994,868	7,099,137	10,068,972
Interest Expense [Abstract]
Interest expense	534,245	596,360	1,059,832	1,266,693
Depreciation [Abstract]
Depreciation expense	1,265,335	1,649,891	2,620,566	3,296,122
Partnership net income (loss) [Abstract]
Operating Income (Loss)	18,047	7,972,322	3,763,592	7,704,519
Assets
Total assets	108,015,747		108,015,747		129,895,112
Public Housing Capital Fund Trusts [Member]
Revenues [Abstract]
Total revenues	719,182	722,990	1,427,968	1,453,892
Interest Expense [Abstract]
Interest expense	369,053	334,545	714,264	635,265
Partnership net income (loss) [Abstract]
Operating Income (Loss)	350,129	388,445	713,704	818,627
Assets
Total assets	56,097,041		56,097,041		57,461,268
MBS Securities Investments [Member]
Revenues [Abstract]
Total revenues				48,755
Interest Expense [Abstract]
Interest expense				14,692
Partnership net income (loss) [Abstract]
Operating Income (Loss)				51,984
Other Investments [Member]
Revenues [Abstract]
Total revenues	1,148,456	424,440	2,099,145	711,484
Partnership net income (loss) [Abstract]
Operating Income (Loss)	1,148,456	$ 424,440	2,099,145	$ 711,484
Assets
Total assets	47,837,858		47,837,858		34,540,280
Consolidation, Eliminations [Member]
Assets
Total assets	$ (50,112,025)		$ (50,112,025)		$ (42,778,661)