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DEBT - Lines of Credit (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
May 12, 2017
USD ($)
Apr. 30, 2016
USD ($)
Revolver 1            
Lines of Credit            
Maximum borrowing capacity $ 70,000   $ 45,000      
Effective interest rate   2.15% 4.09%      
Amount of available credit   $ 33,826 $ 16,140      
Interest expense   1,020 396      
Outstanding balance   36,174 $ 28,860      
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 2.40% 2.00% 2.40%      
Revolver 2            
Lines of Credit            
Maximum borrowing capacity         $ 20,000 $ 15,000
Effective interest rate     4.19% 4.17%    
Amount of available credit $ 12,028   $ 11,262      
Interest expense   $ 17 131      
Outstanding balance $ 2,001   $ 2,001      
Tangible net worth   $ 80,000        
Revolver 2 | London Interbank Offered Rate (LIBOR)            
Lines of Credit            
Spread rate   2.50%