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STOCK COMPENSATION PLAN (Details) - USD ($)
3 Months Ended 6 Months Ended
May 18, 2019
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
May 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Outstanding shares   231,000     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   $ 3,100,000     $ 3,100,000      
Compensation cost related to stock awards   $ 484,000   $ 334,000 $ 839,000 $ 564,000    
Number of shares, Granted   0 60,307   60,307      
Vesting period         3 years      
Unrecognized compensation expense recognition period         2 years 2 months 1 day      
Fair value of shares vested         $ 744,000      
Restricted stock | Non-employee directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Compensation cost related to stock awards   $ 100,000   100,000 $ 200,000 200,000    
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   $ 358,000 $ 715,000 715,000    
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   600,000     $ 600,000      
Unrecognized compensation expense recognition period         1 year 6 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   $ 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