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Segments - Summary of Partnership Reportable Segment Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues:                              
Investment income                         $ 80,976,706 $ 82,266,198 $ 61,342,533
Other interest income                         9,509,307 17,756,044 11,875,538
Property revenues                           4,567,506 7,855,506
Other income                         785,386 310,916  
Total revenues $ 22,586,024 $ 24,345,550 $ 21,969,171 $ 22,370,654 $ 25,184,617 $ 26,474,136 $ 28,303,941 $ 24,937,970 $ 22,029,835 $ 22,604,404 $ 17,232,967 $ 19,206,371 91,271,399 104,900,664 81,073,577
Expenses:                              
Real estate operating (exclusive of items shown below)                           2,663,868 4,738,160
Provision for credit losses (Note 10)                         (1,036,308) (2,347,000)  
Depreciation and amortization                         23,867 1,537,448 2,717,415
Interest expense                         60,032,007 69,066,763 43,559,873
Net result from derivative transactions (Note 15)                         (8,495,426) (7,371,584) (13,095,422)
General and administrative                         19,652,622 20,399,489 17,447,864
Total expenses                         70,176,762 83,948,984 55,367,890
Other income:                              
Gain on sale of real estate assets                         63,739 10,363,363  
Gain on sale of mortgage revenue bond                         2,220,254    
Gain on sale of investments in unconsolidated entities                         117,844 22,725,398 39,805,285
Earnings (losses) from investments in unconsolidated entities                         (2,140,694) (17,879)  
Income before income taxes                         21,355,780 54,022,562 65,510,972
Income tax expense (benefit)                         32,447 10,866 (51,194)
Net income                         21,323,333 54,011,696 65,562,166
Total assets                              
Total assets [1] 1,579,700,160       1,513,400,702               1,579,700,160 1,513,400,702  
Operating Segments [Member] | Affordable Multifamily Investments [Member]                              
Revenues:                              
Investment income                         72,865,558 70,393,234 52,153,336
Other interest income                         8,941,994 17,756,044 11,221,213
Other income                         785,386 310,916  
Total revenues                         82,592,938 88,460,194 63,374,549
Expenses:                              
Provision for credit losses (Note 10)                         (1,254,308) (2,347,000)  
Depreciation and amortization                         23,867 23,846 23,846
Interest expense                         54,566,925 66,112,891 41,640,137
Net result from derivative transactions (Note 15)                         (7,202,354) (7,305,867) (13,095,422)
General and administrative                         19,652,622 20,399,489 17,447,864
Total expenses                         65,786,752 76,883,359 46,016,425
Other income:                              
Gain on sale of mortgage revenue bond                         2,220,254    
Income before income taxes                         19,026,440 11,576,835 17,358,124
Income tax expense (benefit)                         0    
Net income                         19,026,440 11,576,835 17,358,124
Total assets                              
Total assets 1,428,627,104       1,413,596,701               1,428,627,104 1,413,596,701  
Operating Segments [Member] | Seniors and Skilled Nursing Investments [Member]                              
Revenues:                              
Investment income                         3,442,560 1,710,657 58,711
Other interest income                         393,313   654,325
Total revenues                         3,835,873 1,710,657 713,036
Expenses:                              
Provision for credit losses (Note 10)                         218,000    
Interest expense                         2,464,899 998,618 5,750
Net result from derivative transactions (Note 15)                         (1,293,072) (89,844)  
Total expenses                         1,389,827 908,774 5,750
Other income:                              
Income before income taxes                         2,446,046 801,883 707,286
Net income                         2,446,046 801,883 707,286
Total assets                              
Total assets 70,163,422       43,532,926               70,163,422 43,532,926  
Operating Segments [Member] | Market-Rate Joint Venture Investments [Member]                              
Revenues:                              
Investment income                         4,668,588 10,162,307 9,130,486
Total revenues                         4,668,588 10,162,307 9,130,486
Expenses:                              
Interest expense                         3,000,183 1,337,402 870,497
Total expenses                         3,000,183 1,337,402 870,497
Other income:                              
Gain on sale of investments in unconsolidated entities                         117,844 22,725,398 39,805,285
Earnings (losses) from investments in unconsolidated entities                         (2,140,694) (17,879)  
Income before income taxes                         (354,445) 31,532,424 48,065,274
Net income                         (354,445) 31,532,424 48,065,274
Total assets                              
Total assets 183,508,429       140,791,041               183,508,429 140,791,041  
Operating Segments [Member] | MF Properties [Member]                              
Revenues:                              
Other interest income                         174,000    
Property revenues                           4,567,506 7,855,506
Total revenues                         174,000 4,567,506 7,855,506
Expenses:                              
Real estate operating (exclusive of items shown below)                           2,663,868 4,738,160
Depreciation and amortization                           1,513,602 2,693,569
Interest expense                           617,852 1,043,489
Net result from derivative transactions (Note 15)                           24,127  
Total expenses                           4,819,449 8,475,218
Other income:                              
Gain on sale of real estate assets                         63,739 10,363,363  
Income before income taxes                         237,739 10,111,420 (619,712)
Income tax expense (benefit)                         32,447 10,866 (51,194)
Net income                         205,292 10,100,554 $ (568,518)
Total assets                              
Total assets 7,782,906       7,034,690               7,782,906 7,034,690  
Consolidation, Eliminations [Member]                              
Total assets                              
Total assets $ (110,381,701)       $ (91,554,656)               $ (110,381,701) $ (91,554,656)  
[1] The consolidated balance sheets include assets of consolidated VIEs that can only be used to settle obligations of these VIEs that totaled $1,332,121,374 and $1,247,819,817 as of December 31, 2024 and 2023, respectively. The consolidated balance sheets include liabilities of the consolidated VIEs for which creditors do not have recourse to the general credit of the Partnership that totaled $370,876,249 and $374,992,803 as of December 31, 2024 and 2023, respectively. See Note 3 - Variable Interest Entities for further detail.