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13. STOCK-BASED COMPENSATION (Details) | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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