Segments - Summary of Partnership Reportable Segment Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Total revenues
Total revenues	$ 13,736,135	$ 17,664,598
Interest expense
Interest expense	6,017,968	6,394,920
Depreciation expense
Depreciation expense	709,438	819,158
Net income (loss)
Net income	2,981,757	6,451,813
Total assets
Total assets	977,516,262		$ 1,029,168,508
Operating Segments [Member] | Mortgage Revenue Bond Investments Segment [Member]
Total revenues
Total revenues	10,205,803	10,443,413
Interest expense
Interest expense	5,498,199	5,648,568
Depreciation expense
Depreciation expense	2,424
Net income (loss)
Net income	440,336	2,043,354
Total assets
Total assets	912,120,645		918,301,172
Operating Segments [Member] | MF Properties [Member]
Total revenues
Total revenues	1,952,247	1,993,629
Interest expense
Interest expense	321,776	364,389
Depreciation expense
Depreciation expense	707,014	819,158
Net income (loss)
Net income	(252,730)	(437,134)
Total assets
Total assets	69,592,219		70,569,646
Operating Segments [Member] | Public Housing Capital Fund Trusts [Member]
Total revenues
Total revenues	174,470	638,146
Interest expense
Interest expense	197,993	381,963
Net income (loss)
Net income	1,390,999	256,183
Total assets
Total assets	101,848		43,591,048
Operating Segments [Member] | Other Investments [Member]
Total revenues
Total revenues	1,403,615	4,589,410
Net income (loss)
Net income	1,403,152	$ 4,589,410
Total assets
Total assets	98,768,258		87,098,315
Consolidation, Eliminations [Member]
Total assets
Total assets	$ (103,066,708)		$ (90,391,673)