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13. STOCK-BASED COMPENSATION (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of option and warrants outstanding, beginning balance | shares	503,600
Number of option and warrants granted and vested | shares	30,000
Number of option and warrants exercised | shares	(379,400)
Number of option and warrants expired/cancelled | shares	(19,100)
Number of option and warrants outstanding, ending balance | shares	135,100
Weighted-average exercise price of option and warrants outstanding, beginning balance | $ / shares	$ 4.85
Weighted-average exercise price of option and warrants granted and vested | $ / shares	4.55
Weighted-average exercise price of option and warrants exercised | $ / shares	3.65
Weighted-average exercise price of option and warrants expired/cancelled | $ / shares	11.20
Weighted-average exercise price of option and warrants outstanding, ending balance | $ / shares	$ 7.21
Range of exercise price per common share, beginning balance	$3.55 - $24.00
Range of exercise price per common share granted and vested	$4.55
Range of exercise price per common share exercised	$3.57 - $4.56
Range of exercise price per common share expired/cancelled	$7.20 - $24.00
Range of exercise price per common share, ending balance	$3.57 - $9.90

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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