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15. COMMON STOCK (Details) - Common Stock [Member] - Nonvested Shares [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Number of Nonvested Shares |  |
Number of Nonvested Shares Outstanding, Beginning | 44,437 | 58,750
Number of Nonvested Shares Granted | 61,908 | 67,624
Number of Nonvested Shares Vested | (59,782) | (56,937)
Number of Nonvested Shares Forfeited |  | (25,000)
Number of Nonvested Shares Outstanding, Ending | 46,563 | 44,437
Weighted Average Exercise Price |  |
Weighted Average Exercise Price Outstanding, Beginning | $ 5.63 | $ 8.72
Weighted Average Exercise Price Granted | 12.44 | 5.67
Weighted Average Exercise Price Vested | 7.51 | 6.16
Weighted Average Exercise Price Forfeited |  | 7.5
Weighted Average Exercise Price Outstanding, Ending | $ 12.28 | $ 5.63

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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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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