Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 1,600,000 $ 2,200,000 $ 1,900,000
2011 Director Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of common stock purchase (in percent) 90.00%    
Shares reserved for issuance (in shares) 2,459    
Shares eligible for issuance (in shares) 150,000    
Shares issued (in shares) 16,119 15,332 14,470
Compensation Expense $ 36,000 $ 38,000 $ 35,000
2011 Associate Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of common stock purchase (in percent) 90.00%    
Shares reserved for issuance (in shares) 593,750    
Shares remain eligible for issuance 242,859    
Shares issued (in shares) 33,910 27,304 19,503
Compensation Expense $ 160,000 $ 100,000 $ 70,000
Percentage of outstanding stock purchase (in percent) 10.00%    
Maximum Stock purchases under the plan $ 25,000    
Weighted average estimated fair value (in dollars per shares) $ 5.83 $ 3.61 $ 3.57
2011 Associate Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance (in shares) 875,000    
Shares eligible for issuance (in shares) 20,230    
Shares remain eligible for issuance 299,344    
Percentage of award in form of stock 60.00%    
Percentage of award in form of cash bonus 40.00%    
Shares issued (in shares) 21,682    
Compensation Expense $ 1,000,000.0 $ 900,000 $ 1,100,000
Share Based Compensation Arrangement By Share Based Payment Award Grant Date Fair Value of Shares $ 900,000    
Executive Long-Term Incentive Plan President[Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued (in shares) 7,218 10,460 9,810
Compensation Expense $ 100,000 $ 200,000 $ 200,000
Executive Long TermI Incentive Plan CFO [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued (in shares) 7,218 4,812 2,406
Compensation Expense $ 100,000 $ 400,000 $ 200,000
Executive Long Term Incentive Plan CEO [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense $ 200,000 $ 600,000 $ 300,000