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Mortgage Revenue Bonds - Schedule of MRBs Acquisitions (Details) - MRB and Taxable MRB Commitments [Member]
 9 Months Ended
Sep. 30, 2025
USD ($)
Unit
Sep. 30, 2024
USD ($)
Unit
Schedule Of Available For Sale Securities [Line Items]    
Principal Funded $ 13,349,945 $ 56,050,000
Agape Helotes [Member] | Series A-1 [Member] | Helotes, TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Month Acquired [1] May 2025  
Units | Unit [1] 288  
Maturity Date [1] Jan. 01, 2065  
Interest Rate [1] 6.25%  
Principal Funded [1] $ 6,060,000  
Agape Helotes [Member] | Series B [Member] | Helotes, TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Month Acquired [2] May 2025  
Units | Unit [2] 288  
Maturity Date [2] Jan. 01, 2065  
Interest Rate [2] 8.00%  
Principal Funded [2] $ 7,289,945  
Residency at the Mayer [Member] | Series M [Member] | Hollywood, CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Month Acquired [3]   March 2024
Units | Unit [3]   79
Maturity Date [3]   Apr. 01, 2039
Interest Rate [3],[4]   3.60%
Principal Funded [3]   $ 11,500,000
Woodington Gardens Apartments [Member] | Series A-1 [Member] | Baltimore, MD [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Month Acquired   April 2024
Units | Unit   197
Maturity Date   May 01, 2029
Interest Rate   7.80%
Principal Funded   $ 31,150,000
Aventine Apartments [Member] | Bellevue, WA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Month Acquired   May 2024
Units | Unit   68
Maturity Date   Jun. 01, 2031
Interest Rate   7.68%
Principal Funded   $ 9,500,000
Wellspring Apartments [Member] | Long Beach, CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Month Acquired [5]   August 2024
Units | Unit [5]   88
Maturity Date [5]   Sep. 01, 2039
Interest Rate [5]   4.85%
Principal Funded [5]   $ 3,900,000
[1] The Agape Helotes - Series A-1 MRB was acquired at a discount of approximately $514,000 or 8.5% of par.
[2] The Agape Helotes - Series B MRB is a capital appreciation bond, is subordinate to the Series A-1 and Series A-2 (held by third-party investors), and is payable from excess revenues of the underlying property.
[3] The borrower re-allocated $11.5 million of previously provided funding from a taxable MRB to this new MRB during the acquisition and rehabilitation phase of the property.
[4] The interest rate is subject to an all-in floor of 3.85%.
[5] The investment was previously reported as the Anaheim & Walnut bond purchase commitment and has converted to an MRB.