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STOCK-BASED COMPENSATION PLANS (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 24, 2020
USD ($)
$ / shares
shares
Jan. 28, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
installment
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Oct. 10, 2019
$ / shares
Oct. 09, 2019
shares
STOCK-BASED COMPENSATION PLANS              
Total stock-based compensation expense (benefit)     $ 214 $ 343 $ 540    
Special dividend per share | $ / shares           $ 9.43  
Restricted Stock Units              
STOCK-BASED COMPENSATION PLANS              
Granted (in units) | shares     73,700        
Granted (in dollars per unit) | $ / shares     $ 18.98        
Total stock-based compensation expense (benefit)     $ 351        
Unrecognized compensation cost related to non-vested stock-based compensation agreements     $ 997        
Outstanding (in dollars per unit) | $ / shares     $ 18.98        
Restricted Stock Units | Key employees              
STOCK-BASED COMPENSATION PLANS              
Shares granted | shares   70,400          
Vesting period   4 years          
Restricted Stock Units | Non employee directors              
STOCK-BASED COMPENSATION PLANS              
Shares granted | shares 550 2,750          
Granted (in dollars per unit) | $ / shares $ 12.71 $ 19.03          
Fair value of units granted $ 7 $ 1,392          
Stock Appreciation Rights              
STOCK-BASED COMPENSATION PLANS              
Granted (in units) | shares       110,160      
Vesting period     4 years        
Total stock-based compensation expense (benefit)     $ (137) $ 343 $ 540    
Unrecognized compensation cost related to non-vested stock-based compensation agreements     51        
Stock appreciation rights plan liability recorded for the outstanding units     272 409      
Stock appreciation rights plan liability recorded for the previously exercised units     $ 1,087 $ 1,512      
Number of equal annual instalments in which the liability recorded for previously exercised units will be paid | installment     4        
Outstanding (in dollars per unit) | $ / shares     $ 16.32        
Omnibus Incentive Plan              
STOCK-BASED COMPENSATION PLANS              
Authorized number of shares | shares             1,820,000