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13. STOCK-BASED COMPENSATION (Details 1) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]    
Outstanding 135,100 503,600
Range of exercise prices, lower limit $ 3.55  
Range of exercise prices, upper limit $ 9.90  
Weighted average remaining contractual life (years) 1 year 6 months 18 days