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STOCKHOLDERS' EQUITY - Stock options (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
STOCKHOLDERS' EQUITY        
Number of Options, Grants     20,000  
Number of Options, Exercised   (60,240) (197,256)  
Stock options        
STOCKHOLDERS' EQUITY        
Number of Options, Outstanding at Beginning of Year   3,771,000    
Number of Options, Grants 6,887 6,887    
Number of Options, Exercised   (60,000)    
Number of Option, Forfeited/cancelled/expired/settled   0    
Number of Options, Balance at End of Year 3,718,000 3,718,000   3,771,000
Number of Options, Vested and expected to vest 3,717,000 3,717,000    
Number of Options, Unvested 11,000 11,000    
Number of Options, Exercisable 3,707,000 3,707,000    
Weighted-Average Exercise Price, Outstanding at Beginning of Year (in dollars per share)   $ 2.18    
Weighted-Average Exercise Price, Grants (in dollars per share)   3.63    
Weighted-Average Exercise Price, Exercised (in dollars per share)   0.83    
Weighted-Average Exercise Price, Forfeited/cancelled/expired/settled (in dollars per share)   0    
Weighted-Average Exercise Price, Balance at End of Year (in dollars per share) $ 2.20 2.20   $ 2.18
Weighted-Average Exercise Price, Vested and expected to vest (in dollars per share) 2.20 2.20    
Weighted-Average Exercise Price, Unvested (in dollars per share) 7.26 7.26    
Weighted-Average Exercise Price, Exercisable (in dollars per share) $ 2.19 $ 2.19    
Weighted-Average Remaining Contractual Term, Outstanding (in years)   5 years 3 months 10 days   5 years 8 months 4 days
Weighted-Average Remaining Contractual Term, Grants (in years)   0 years    
Weighted-Average Remaining Contractual Term, Exercised (in years)   0 years    
Weighted-Average Remaining Contractual Term, Forfeited/cancelled/expired/settled (in years)   0 years    
Weighted-Average Remaining Contractual Term, Vested and expected to vest (in years)   5 years 3 months 10 days    
Weighted-Average Remaining Contractual Term, Unvested (in years)   9 years 3 months 3 days    
Weighted-Average Remaining Contractual Term, Exercisable (in years)   5 years 3 months 7 days    
Aggregate Intrinsic Value, Outstanding $ 7,794,000 $ 7,794,000   $ 4,660,000
Aggregate Intrinsic Value, Grants 0 0    
Aggregate Intrinsic Value, Exercised   0    
Aggregate Intrinsic Value, Forfeited/cancelled/expired/settled 0 0    
Aggregate Intrinsic Value, Vested and expected to vest 7,794,000 7,794,000    
Aggregate Intrinsic Value, Unvested 0 0    
Aggregate Intrinsic Value, Exercisable $ 7,794,000 $ 7,794,000