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7. COMMON STOCK (Details - Option activity) - Stock Options [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Options
Number of Options Outstanding, Beginning	2,403,800	2,707,327
Number of Options Granted	500,000	0
Number of Options Exercised	(71,900)	(245,800)
Number of Options Forfeited/Expired	(144,200)	(57,727)
Number of Options Outstanding, Ending	2,687,700	2,403,800
Number of Options Exercisable, Ending	896,100
Weighted Average Exercise Price
Weighted Average Exercise Price Outstanding, Beginning	$ 2.01	$ 2.00
Weighted Average Exercise Price Granted	3.87
Weighted Average Exercise Price Exercised	2.40	1.75
Weighted Average Exercise Price Forfeited/Expired	2.91	2.40
Weighted Average Exercise Price Outstanding, Ending	2.30	$ 2.01
Weighted Average Exercise Price Exercisable, Ending	$ 1.91
Weighted Average Remaining Contractual Term
Weighted average contractual term - ending	7 years 8 months 26 days	8 years 5 months 12 days
Weighted average contractual term - exercisable	7 years 5 months 1 day
Aggregate Intrinsic Value
Aggregate intrinsic value - ending	$ 6,294,948	$ 19,565,450
Aggregate intrinsic value - exercisable	$ 2,445,264

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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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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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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 vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Number of share options (or share units) exercised during the current period.

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