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Line of Credit (Details) - Revolving line of credit
1 Months Ended 15 Months Ended
May 14, 2019
USD ($)
Aug. 31, 2020
Mar. 31, 2020
Jul. 31, 2020
Mar. 31, 2022
USD ($)
default_cure
Mar. 14, 2022
default_cure
Mar. 13, 2022
default_cure
Dec. 31, 2021
USD ($)
Dec. 04, 2020
USD ($)
Sep. 28, 2020
USD ($)
Line of Credit Facility [Line Items]                    
Line of credit, principal amount         $ 48,734,000     $ 61,958,000    
First Revolving Line Of Credit, Refinanced                    
Line of Credit Facility [Line Items]                    
Current borrowing capacity $ 50,000,000                 $ 125,000,000
Line of credit, principal amount $ 150,000,000               $ 250,000,000  
Advance rate 85.00%   90.00%              
Gross amount outstanding         48,734,000     61,958,000    
Issuance costs         628,000     720,000    
Amount outstanding         48,105,000     61,238,000    
Minimum liquidity $ 50,000,000       $ 50,000,000     $ 50,000,000    
Number of times a borrower can cure a default | default_cure         3 5 2      
London Interbank Offered Rate (LIBOR) | First Revolving Line Of Credit, Refinanced                    
Line of Credit Facility [Line Items]                    
Basis spread on variable rate   7.50%   11.00%            
Minimum | London Interbank Offered Rate (LIBOR) | First Revolving Line Of Credit, Refinanced                    
Line of Credit Facility [Line Items]                    
Basis spread on variable rate   2.00%