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Debt Obligations - Components of obligations (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
May 31, 2019
Line of Credit Facility [Line Items]          
Outstanding face amount/Carrying value $ 20,613,000 $ 20,613,000      
Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Outstanding face amount/Carrying value 20,613,000 $ 20,613,000 $ 14,625,000 $ 14,625,000  
Maximum facility size $ 30,000,000       $ 15,000,000
Weighted average funding cost 5.30%        
Weighted average life 1 year 1 month 6 days