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LONG-TERM DEBT - Outstanding Indebtedness (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Apr. 30, 2020
Long-term debt    
Total Debt $ 57,000,000  
Stated Interest Rate (as a percent) 2.27%  
Subsequent Event | Minimum    
Long-term debt    
Stated Interest Rate (as a percent)   1.83%
Subsequent Event | Maximum    
Long-term debt    
Stated Interest Rate (as a percent)   2.43%
Credit Facility    
Long-term debt    
Total Debt $ 57,000,000  
Credit Facility | Subsequent Event    
Long-term debt    
Outstanding debt   $ 50,000,000
Credit Facility | LIBOR | Minimum    
Long-term debt    
Margin added to variable rate basis (as a percent) 1.35%  
Credit Facility | LIBOR | Maximum    
Long-term debt    
Margin added to variable rate basis (as a percent) 1.95%  
Credit Facility | LIBOR | Subsequent Event    
Long-term debt    
Stated Interest Rate (as a percent)   0.48%