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General Partners and Other Related Parties - Additional Information (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
Loan
Mar. 31, 2021
USD ($)
Loan
Dec. 31, 2021
USD ($)
General Partners And Other Related Parties Details [Line Items]      
Management fee, description The general partners are entitled to monthly fees for managing the partnership’s loan portfolio and operations of up to 1/32 of 1% of the “net asset value” (3/8 of 1% annually).    
Loan Brokerage Commissions, Maximum Percent of Assets 4.00%    
Payable to related party (Note 3) $ 62,000   $ 47,000
Partial settlement of payable to related parties offset by receivable 4,000    
Amount due from manager and related mortgage funds, net 4,000   0
Number of performing loans | Loan   5  
Performing loans mortgaged, par value   $ 4,672,000  
Limited partners’ capital 66,348,000   $ 69,555,000
RMC and Burwell [Member]      
General Partners And Other Related Parties Details [Line Items]      
Due to related party 66,000    
Payable to related party (Note 3) $ 62,000    
Number of performing loans | Loan 0 1  
Performing loans mortgaged, par value   $ 624,000  
Partnership Agreement [Member] | Limited Partner [Member]      
General Partners And Other Related Parties Details [Line Items]      
Limited partners’ capital $ 500,000    
Formation Loan [Member]      
General Partners And Other Related Parties Details [Line Items]      
Formation loan, advances 22,567,000    
Receivable from affiliate (formation loan) 3,236,000    
RMC [Member]      
General Partners And Other Related Parties Details [Line Items]      
Brokerage commissions paid to RMC $ 214,000 $ 165,000  
Maximum [Member]      
General Partners And Other Related Parties Details [Line Items]      
Annual mortgage servicing fee, percentage 1.50%    
Percentage of offering proceeds 7.00%