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Allowance for Credit Losses - Summary of Changes in Partnership's Allowance for Credit Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Balance, beginning of period |  | $ 3,058,000 |  | $ 3,291,000 | $ 3,230,000 |  | $ 4,097,000
Current provision for credit losses |  | 345,734 | [1] | 189,000 | 173,734 | [2] | (617,000)
Recovery of prior credit loss |  |  |  |  | 62,224 |  | (34,500)
Balance, end of period |  | 3,403,734 |  | 3,480,000 | 3,403,734 |  | 3,480,000
MRB and taxable MRB investments [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Balance, beginning of period |  | 4,111,882 |  | 9,892,924 | 4,128,849 |  | 9,910,079
Current provision for credit losses | [3] | 8,707,000 |  | (169,308) | 8,707,000 |  | (169,308)
Write-offs | [4] |  |  | (5,542,921) |  |  | (5,542,921)
Recovery of prior credit loss | [5] | 79,191 |  | (17,345) | 62,224 |  | (34,500)
Balance, end of period | [6] | 12,898,073 |  | 4,163,350 | 12,898,073 |  | 4,163,350
Governmental Issuer Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Balance, beginning of period |  | 941,000 |  | 1,166,000 | 1,038,000 |  | 1,294,000
Current provision for credit losses |  | (245,000) | [1] | (55,000) | (342,000) | [2] | (183,000)
Balance, end of period |  | 696,000 |  | 1,111,000 | 696,000 |  | 1,111,000
Taxable Governmental Issuer Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Balance, beginning of period |  | 141,000 |  | 41,000 | 76,000 |  | 77,000
Current provision for credit losses |  | 71,000 | [1] | (5,000) | 136,000 | [2] | (41,000)
Balance, end of period |  | 212,000 |  | 36,000 | 212,000 |  | 36,000
Property Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Balance, beginning of period |  | 1,858,000 |  | 1,628,000 | 1,930,000 |  | 2,048,000
Current provision for credit losses |  | 607,734 | [1] | 320,000 | 535,734 | [2] | (100,000)
Balance, end of period |  | 2,465,734 |  | 1,948,000 | 2,465,734 |  | 1,948,000
Unfunded Commitments [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Balance, beginning of period |  | 118,000 |  | 456,000 | 186,000 |  | 678,000
Current provision for credit losses |  | (88,000) | [1] | (71,000) | (156,000) | [2] | (293,000)
Balance, end of period |  | $ 30,000 |  | $ 385,000 | $ 30,000 |  | $ 385,000
[1] | The current provision for credit losses includes an asset-specific allowance of approximately $624,000 related to the Opportunity South Carolina property loan
[2] | The current provision for credit losses includes an asset-specific allowance of approximately $624,000 related to the Opportunity South Carolina property loan.
[3] | During the three and six months ended June 30, 2025, the Partnership recognized a provision for credit loss of approximately $8.7 million related to The Park at Sondrio MRB and taxable MRB, The Park at Vietti MRB and taxable MRB, and the Windsor Shores Apartments MRB and taxable MRB. The credit loss was driven primarily by worse than projected operating results, financial conditions of the borrowers, and estimated underlying collateral values.
[4] | In connection with the final settlement of the bankruptcy estate of the Provision Center 2014-1 MRB in July 2024, the Partnership recovered approximately $169,000 of its previously recognized allowance for credit loss and the remainder of the allowance associated with the MRB was written off.
[5] | The Partnership compared the present value of cash flows expected to be collected to the amortized cost basis of the Live 929 Apartments Series 2022A MRB, which indicated a recovery of value. As the recovery was identified prior to the effective date of the CECL standard, the Partnership will accrete the recovery of prior credit loss into investment income over the term of the MRB.
[6] | The allowance for credit losses as of June 30, 2025 was related to the Live 929 Apartments – 2022A MRB, The Park at Sondrio MRB and taxable MRB, The Park at Vietti MRB and taxable MRB, and the Windsor Shores Apartments MRB and taxable MRB. The allowance for credit losses as of June 30, 2024 was related to the Live 929 Apartments – 2022A MRB.

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