15. COMMON STOCK (Details) - Common Stock [Member] - Nonvested Shares [Member] - $ / shares	12 Months Ended
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

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

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

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