13. STOCK-BASED COMPENSATION (Details)	3 Months Ended
	Mar. 31, 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	(2,500)
Number of option and warrants outstanding, ending balance | shares	132,600
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	9.90
Weighted-average exercise price of option and warrants, ending balance | $ / shares	$ 7.16
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	$9.90
Range of exercise price per common share, ending balance	$3.57 - $9.50