16. STOCK OPTIONS AND WARRANTS (Details-Options Outstanding and Exercisable) - Employee Stock Option [Member] - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Outstanding	341,808	239,704	296,406
Weighted Average Remaining Contractual Life	6 years 26 days	5 years 7 months 17 days
Weighted Average Exercise Price	$ 11.27	$ 9.25	$ 11.5
Aggregate Intrinsic Value	$ 21,366,745
Number of Exercisable	233,475
Weighted Average Exercise Price	$ 12.23
Aggregate Intrinsic Value	$ 14,369,261
4.09 - 8.00 [Member]
Range of Exercise Price, Lower	$ 4.09	4.09
Range of Exercise Price, Upper	$ 8.00	$ 8.00
Number of Outstanding	194,108	148,404
Weighted Average Remaining Contractual Life	7 years 5 months 1 day	7 years 11 months 4 days
Weighted Average Exercise Price	$ 6.23	$ 6.73
Aggregate Intrinsic Value	$ 13,111,999	$ 5,187
Number of Exercisable	125,567	104,415
Weighted Average Exercise Price	$ 6.83	$ 7.13
Aggregate Intrinsic Value	$ 8,406,649	$ 5,187
10.00 - 13.50 [Member]
Range of Exercise Price, Lower	$ 10.00	$ 10.00
Range of Exercise Price, Upper	$ 13.50	$ 13.50
Number of Outstanding	111,200	91,300
Weighted Average Remaining Contractual Life	2 years 5 months 20 days	1 year 10 months 21 days
Weighted Average Exercise Price	$ 13.23	$ 13.33
Aggregate Intrinsic Value	$ 6,732,736	$ 0
Number of Exercisable	92,450	91,300
Weighted Average Exercise Price	$ 13.33	$ 13.33
Aggregate Intrinsic Value	$ 5,588,611
17.44 - 52.69 [Member]
Range of Exercise Price, Lower	$ 17.44
Range of Exercise Price, Upper	$ 52.69
Number of Outstanding	36,500	239,704
Weighted Average Remaining Contractual Life	9 years 10 months 10 days
Weighted Average Exercise Price	$ 32.08	$ 9.25
Aggregate Intrinsic Value	$ 1,522,010	$ 5,187
Number of Exercisable	15,458	195,715
Weighted Average Exercise Price	$ 49.59	$ 10.02
Aggregate Intrinsic Value	$ 374,001	$ 5,187

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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