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STOCK-BASED COMPENSATION - outstanding options (Details) - Stock Option [Member] - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 226,075  
Number of Shares, Granted 0  
Number of Shares, Exercised (1,000)  
Number of Shares, Forfeited (4,158)  
Number of Shares, Expired 0  
Number of Shares, Outstanding 220,917 226,075
Number of Shares, Vested 186,415  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) $ 6.30  
Weighted Average Exercise Price per share, Exercised (in dollars per share) 2.92  
Weighted Average Exercise Price per share, Forfeited (in dollars per share) 5.34  
Weighted Average Exercise Price per share, Expired (in dollars per share) 0  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) 6.34 $ 6.30
Weighted Average Exercise Price per share, Vested (in dollars per share) $ 6.16  
Weighted Average Remaining Contractual Life, Outstanding (Years) 4 years 3 months 18 days 4 years 8 months 12 days
Weighted Average Remaining Contractual Life, Vested (Years) 3 years 8 months 12 days  
Aggregate Intrinsic Value, Outstanding and Vested (in dollars) $ 53,965 $ 219,983
Aggregate Intrinsic Value, Vested (in dollars) $ 53,965