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13. STOCK-BASED COMPENSATION (Details)
 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Number of Option and Warrants Outstanding, Beginning balance | shares 2,518,000
Number of Option and Warrants Granted and Vested | shares 150,000
Number of Option and Warrants Exercised | shares (1,897,000)
Number of Option and Warrants Expired | shares (40,500)
Number of Option and Warrants Outstanding, Ending Balance | shares 730,500
Weighted- Average Exercise price of Option and Warrants, Beginning balance | $ / shares $ .97
Weighted- Average Exercise price of Option and Warrants, Granted and vested during the period | $ / shares .91
Weighted- Average Exercise price of Option and Warrants, Exercised | $ / shares .73
Weighted- Average Exercise price of Option and Warrants, Expired | $ / shares 2.61
Weighted- Average Exercise price of Option and Warrants, Ending Balance | $ / shares $ 1.48
Range of Exercise Price per Common Share, Beginning Balance $0.71 - $4.80
Range of Exercise Price per Common Share, Granted and Vested $0.91
Range of Exercise Price per Common Share, Exercised $0.73
Range of Exercise Price per Common Share, Expired $2.61
Range of Exercise Price per Common Share, Ending Balance $0.71 - $2.55