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BORROWINGS - Revolving Credit Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Aug. 02, 2019
Line of Credit Facility [Line Items]      
Long-term line of credit $ 10,500 $ 0  
Unsecured revolving credit agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 30,000
Debt instrument, interest rate, stated percentage (as a percent) 1.75%    
Long-term line of credit $ 10,500 $ 0  
Unsecured revolving credit agreement | Prime Rate [Member]      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate (as a percent) (1.50%)