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STOCK-BASED COMPENSATION - Narrative (Details) - $ / shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Apr. 17, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares)     370,000
Number of shares available for grant (in shares) 144,393    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 5,000 15,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value $ 4.00 $ 6.88  
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentages of stock option ownership considered for higher exercise price of option 10.00%    
Vesting period of stock options 2 years    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option exercise price as percentages of closing exercise price of stock for specific shareholders 110.00%    
Vesting period of stock options 3 years    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of stock option plan 10 years    
Incentive Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of stock option plan 5 years