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STOCK COMPENSATION PLAN (Details) - USD ($)
3 Months Ended
May 18, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
May 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding shares   231,000   231,000  
Exercise of stock options (in shares)   0      
Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested stock options   $ 3,800,000      
Compensation cost related to stock awards   $ 354,000 $ 229,000    
Number of shares, Granted   60,307      
Vesting period   3 years      
Unrecognized compensation expense recognition period   2 years 4 months 24 days      
Fair value of shares vested   $ 743,957      
Restricted stock | Non-employee directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to stock awards   $ 100,000      
Number of shares, Granted   38,900      
Vesting percentage   33.00%      
Service period (in years)   3 years      
Vesting period   3 years      
Performance Restricted Share Units ("Prsus")          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost related to stock awards   $ 358,000      
Number of PRSUs awarded   90,000      
Directors' fees | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested stock options   $ 700,000      
Unrecognized compensation expense recognition period   1 year 9 months      
Equity Incentive Plan 2019          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, shares authorized, maximum         340,000
Equity Incentive Plan 2019 | Stock Option | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of exercise price to the fair market value   100.00%      
Equity Incentive Plan 2019 | Incentive stock options granted to any 10% stockholder | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of the exercise price to the fair market value of the shares covered by the stock option on the date of grant in the case of an ISO granted to 10% stockholder   110.00%      
Equity Incentive Plan 2009          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding shares         468,382
Number of shares expired 628,719        
Compensation cost related to stock awards   $ 0 $ 0    
Equity Incentive Plan 2009 | Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested stock options   $ 0   $ 0  
Equity Incentive Plan 2009 | Equity Incentive Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, exercise period from the grant date   10 years      
Equity Incentive Plan 2009 | Incentive stock options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, exercise period from the grant date   5 years