Segments - Summary of Partnership Reportable Segment Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Total revenues
Total revenues	$ 14,387,488	$ 13,736,135
Interest expense
Interest expense	5,226,475	6,017,968
Depreciation expense
Depreciation expense	683,460	709,438
Net income (loss)
Net income (loss)	6,992,854	2,981,757
Total assets
Total assets	1,191,860,119		$ 1,175,247,879
Operating Segments [Member] | Mortgage Revenue Bond Investments Segment [Member]
Total revenues
Total revenues	10,794,788	10,205,803
Interest expense
Interest expense	4,944,277	5,498,199
Depreciation expense
Depreciation expense	5,811	2,424
Net income (loss)
Net income (loss)	2,549,452	440,336
Total assets
Total assets	1,131,733,809		1,114,146,614
Operating Segments [Member] | MF Properties [Member]
Total revenues
Total revenues	1,694,524	1,952,247
Interest expense
Interest expense	282,198	321,776
Depreciation expense
Depreciation expense	677,649	707,014
Net income (loss)
Net income (loss)	(262,819)	(252,730)
Total assets
Total assets	67,649,074		67,988,190
Operating Segments [Member] | Public Housing Capital Fund Trusts [Member]
Total revenues
Total revenues		174,470
Interest expense
Interest expense		197,993
Net income (loss)
Net income (loss)		1,390,999
Operating Segments [Member] | Other Investments [Member]
Total revenues
Total revenues	1,898,176	1,403,615
Net income (loss)
Net income (loss)	4,706,221	$ 1,403,152
Total assets
Total assets	94,728,344		106,931,182
Consolidation, Eliminations [Member]
Total assets
Total assets	$ (102,251,108)		$ (113,818,107)