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STOCK OPTIONS - STOCK COMPENSATION - outstanding options (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 200,878  
Weighted Average Exercise Price per share, Forfeited (in dollars per share) $ 6.38  
Weighted Average Exercise Price per share, Expired (in dollars per share) 2.92  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) $ 6.59  
Weighted Average Remaining Contractual Life, Outstanding (Years) 4 years 1 month 6 days  
Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 226,075 218,075
Number of Shares, Granted 0 8,000
Number of Shares, Exercised (6,226) 0
Number of Shares, Forfeited (7,998) 0
Number of Shares, Expired (10,973) 0
Number of Shares, Outstanding   226,075
Number of Shares, Vested 195,544  
Weighted Average Exercise Price per share, Outstanding (in dollars per share) $ 6.30 $ 6.22
Weighted Average Exercise Price per share, Granted (in dollars per share)   8.55
Weighted Average Exercise Price per share, Exercised (in dollars per share) 2.92  
Weighted Average Exercise Price per share, Outstanding (in dollars per share)   $ 6.30
Weighted Average Exercise Price per share, Vested (in dollars per share) $ 6.54  
Aggregate Intrinsic Value, Outstanding (in dollars) $ 85,663  
Aggregate Intrinsic Value, Vested (in dollars) $ 85,663