Segments - Summary of Partnership Reportable Segment Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Total revenues
Total revenues	$ 62,318,013	$ 81,355,576
Interest expense
Interest expense	24,717,294	24,863,056
Depreciation expense
Depreciation expense	3,088,117	3,488,058
Net income (loss)
Net income	30,492,151	41,139,529
Total assets
Total assets	1,029,168,508	982,713,246
Operating Segments [Member] | Mortgage Revenue Bond Investments Segment [Member]
Total revenues
Total revenues	41,348,004	57,625,273
Interest expense
Interest expense	21,862,030	22,231,479
Net income (loss)
Net income	3,835,002	22,048,372
Total assets
Total assets	918,301,172	864,311,647
Operating Segments [Member] | MF Properties [Member]
Total revenues
Total revenues	8,081,029	9,149,105
Interest expense
Interest expense	1,444,700	1,699,121
Depreciation expense
Depreciation expense	3,088,117	3,488,058
Net income (loss)
Net income	(964,355)	3,676,560
Total assets
Total assets	70,569,646	71,120,280
Operating Segments [Member] | Public Housing Capital Fund Trusts [Member]
Total revenues
Total revenues	2,368,541	2,479,494
Interest expense
Interest expense	1,410,564	932,456
Net income (loss)
Net income	957,977	406,019
Total assets
Total assets	43,591,048	48,942,334
Operating Segments [Member] | Other Investments [Member]
Total revenues
Total revenues	10,520,439	12,101,704
Net income (loss)
Net income	26,663,527	15,008,578
Total assets
Total assets	87,098,315	85,048,514
Consolidation, Eliminations [Member]
Total assets
Total assets	$ (90,391,673)	$ (86,709,529)