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Transactions with Related Parties - Summary of Transactions with Related Parties Reflected on the Partnership's Consolidated Financial Statements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Reimbursable franchise margin taxes incurred on behalf of unconsolidated entities | [1] | $ 169,000 | $ 328,000
Referral fees paid to an affiliate | [2] | 213,500 | 240,607
General Partner [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Administrative fees | [3] | $ 6,319,000 | $ 5,200,000
[1] | The Partnership pays franchise margin taxes on revenues in Texas related to its investments in unconsolidated entities. Such taxes are paid by the Partnership as the unconsolidated entities are required by tax regulations to be included in the Partnership’s group franchise tax return. Since the Partnership is reimbursed for the franchise margin taxes paid on behalf of the unconsolidated entities, these taxes are not reported on the Partnership’s consolidated statements of operations.
[2] | The Partnership has an agreement with an affiliate of Greystone, in which the Greystone affiliate is entitled to receive a referral fee up to 0.25% of the original principal amount of executed tax-exempt loan or tax-exempt bond transactions introduced to the Partnership by the Greystone affiliate. The term of the agreement ends December 31, 2024, unless the parties mutually agree to extend the term. The Partnership accounts for referral fees as bond acquisition costs that are deferred and amortized as a yield adjustment to the related investment asset.
[3] | AFCA 2 is entitled to receive an administrative fee from the Partnership equal to 0.45% per annum of the outstanding principal balance of any of its investment assets for which the owner of the financed property or other third party is not obligated to pay such administrative fee directly to AFCA 2. The disclosed amounts represent administrative fees paid or accrued during the periods specified and are reported within “General and administrative expenses” on the Partnership’s consolidated statements of operations.

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- Definition Amount paid to managing member or general partner, affiliate of managing member or general partner, or affiliate of limited liability company (LLC) or limited partnership (LP) for administrative services provided to the LLC or LP, for example, but not limited to, salaries, rent, or overhead costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-17 + Details
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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-3 + Details
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