Transactions with Related Parties - Summary of Transactions with Related Parties Reflected on the Partnership's Consolidated Financial Statements (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Reimbursable franchise margin taxes incurred on behalf of unconsolidated entities	[1]	$ 156,000	$ 53,000
Referral fees paid to an affiliate	[2]	224,750
General Partner [Member]
Related Party Transaction [Line Items]
Administrative fees	[3]	$ 4,046,000	$ 3,585,000

[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 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 equal 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 terms of the agreement end December 31, 2022, unless the parties mutually agree to extend the term.

[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 MRBs, GILs, property loans collateralized by real property, and other investments 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.