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Fair value measurement - Not carried at Fair Value (Details) - USD ($)
Sep. 30, 2021
Jun. 25, 2021
Jun. 10, 2021
Dec. 31, 2020
Loans:        
Principal Balance $ 482,089,565     $ 424,174,758
Carrying Value 480,462,652     422,280,515
Fair Value 478,397,706     419,407,194
Liabilities:        
Principal Balance 373,228,429     241,152,827
Other Long-term Debt 368,189,495     239,132,654
Fair Value 373,532,517     239,327,483
Unsecured note payable        
Loans:        
Principal Balance 85,125,000      
Fair Value 85,193,100      
Liabilities:        
Principal Balance   $ 6,600,000 $ 78,500,000  
Revolving line of credit        
Loans:        
Principal Balance 42,239,289      
Fair Value 42,597,991      
Liabilities:        
Principal Balance 25,299,713      
Level 3        
Loans:        
Fair Value 478,397,706     419,407,194
Allowance for loan losses (4,319,563)     (3,738,758)
Liabilities:        
Fair Value 288,339,417     239,327,483
Level 3 | Loans held for investment, net        
Loans:        
Principal Balance 482,089,565     419,924,758
Carrying Value 484,782,215     421,725,220
Fair Value 478,397,706     415,113,225
Level 3 | Loans Held For Investment Acquired Through Participation        
Loans:        
Principal Balance 0     4,250,000
Carrying Value 0     4,294,053
Fair Value 0     4,293,969
Level 3 | Term loans payable        
Liabilities:        
Principal Balance 93,595,027     107,584,451
Other Long-term Debt 91,633,624     105,245,801
Fair Value 94,197,966     107,248,555
Level 3 | Obligations Under Participation Agreements        
Liabilities:        
Principal Balance 105,566,232     71,266,303
Other Long-term Debt 106,190,225     71,581,897
Fair Value 105,281,167     70,693,207
Level 3 | Mortgage loan payable        
Liabilities:        
Principal Balance 32,164,575     44,020,225
Other Long-term Debt 32,301,666     44,117,293
Fair Value 32,391,423     44,348,689
Level 3 | Secured borrowing        
Liabilities:        
Principal Balance 31,477,882     18,281,848
Other Long-term Debt 31,525,439     18,187,663
Fair Value 31,169,148     17,037,032
Level 3 | Revolving line of credit        
Liabilities:        
Principal Balance 25,299,713     0
Other Long-term Debt 24,832,405     0
Fair Value 25,299,713     0
Level 1 | Unsecured note payable        
Liabilities:        
Principal Balance 85,125,000     0
Other Long-term Debt 81,706,136     0
Fair Value $ 85,193,100     $ 0