13. STOCK-BASED COMPENSATION (Details)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of option and warrants outstanding, beginning balance | shares	135,100
Number of option and warrants exercised | shares	0
Number of option and warrants expired | shares	(7,500)
Number of option and warrants outstanding, ending balance | shares	127,600
Weighted-average exercise price of option and warrants, beginning balance | $ / shares	$ 7.21
Weighted-average exercise price of option and warrants exercised | $ / shares	.00
Weighted-average exercise price of option and warrants expired | $ / shares	9.17
Weighted-average exercise price of option and warrants, ending balance | $ / shares	$ 7.09
Range of exercise price per common share, beginning balance	$3.57 - $9.90
Range of exercise price per common share exercised	$0.00
Range of exercise price per common share expired	$0.00
Range of exercise price per common share, ending balance	$3.57 - $7.27