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STOCK-BASED COMPENSATION - Outstanding options (Details) - Stock Option [Member] - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 200,878  
Number of Shares, Granted 0  
Number of Shares, Exercised 0  
Number of Shares, Forfeited 6,180  
Number of Shares, Expired 16,199  
Number of Shares, Outstanding 178,499 200,878
Number of Shares, Vested 175,831  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) $ 6.59  
Weighted Average Exercise Price per share, Forfeited (in dollars per share) 7.61  
Weighted Average Exercise Price per share, Expired (in dollars per share) 4.37  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) 6.76 $ 6.59
Weighted Average Exercise Price per share, Vested (in dollars per share) $ 6.73  
Weighted Average Remaining Contractual Life, Outstanding (Years) 3 years 8 months 12 days 4 years 1 month 6 days
Weighted Average Remaining Contractual Life, Vested (Years) 3 years 7 months 6 days  
Aggregate Intrinsic Value, Outstanding (in dollars) $ 83,910 $ 85,663
Aggregate Intrinsic Value, Vested (in dollars) $ 83,910