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DEBT - Lines of Credit (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
May 12, 2017
Apr. 30, 2016
Revolver 1              
Lines of Credit              
Maximum borrowing capacity     $ 70,000   $ 45,000    
Effective interest rate 2.11%            
Amount of available credit $ 24,653            
Interest expense 226 $ 320          
Outstanding balance 45,347     $ 36,174      
Tangible net worth $ 120,000            
Debt to EBITDA ratio 4            
Payments of arrangement fees and other fees     $ 300        
Revolver 1 | London Interbank Offered Rate (LIBOR)              
Lines of Credit              
Spread rate 2.00%   2.40%        
Revolver 2              
Lines of Credit              
Maximum borrowing capacity           $ 20,000 $ 15,000
Effective interest rate   4.17%          
Amount of available credit   $ 12,028          
Interest expense   21          
Outstanding balance   $ 2,001          
Revolver 2 | London Interbank Offered Rate (LIBOR)              
Lines of Credit              
Spread rate 2.50%