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STOCK-BASED COMPENSATION - Outstanding options (Details) - Stock Option [Member] - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 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 0  
Number of Shares, Expired 0  
Number of Shares, Outstanding 200,878 200,878
Number of Shares, Vested 198,210  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) $ 6.59  
Weighted Average Exercise Price per share, Forfeited (in dollars per share) 0.00  
Weighted Average Exercise Price per share, Expired (in dollars per share) 0  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) 6.59 $ 6.59
Weighted Average Exercise Price per share, Vested (in dollars per share) $ 6.56  
Weighted Average Remaining Contractual Life, Outstanding (Years) 3 years 9 months 18 days 4 years 1 month 6 days
Weighted Average Remaining Contractual Life, Vested (Years) 3 years 9 months 18 days  
Aggregate Intrinsic Value, Outstanding (in dollars) $ 118,716 $ 85,663
Aggregate Intrinsic Value, Vested (in dollars) $ 118,716