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BORROWINGS - Revolving Credit Agreement (Details) - Unsecured revolving credit agreement - USD ($)
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Aug. 02, 2019
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 30,000,000
Debt instrument, term 1 year    
Outstanding borrowings $ 0 $ 0