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NOTE 6 — Stock-Based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of employee service stock-based compensation, allocation of recognized period costs

		Years Ended December 31,
Income Statement Classification		2021				2020
Cost of revenues		$	96,254			$	86,649
Research and development			218,559				137,537
Sales and marketing			166,266				121,802
General and administrative			212,346				161,063
Stock-based compensation expenses		$	693,425			$	507,051

Stock options' weighted average assumptions and grant date fair values

		Years Ended December 31,
		2021				2020
Risk-free interest rate (%)			1.64	%			0.68	%
Dividend yield			—				—
Volatility factor			102.26	%			43.62	%
Expected option life (years)			3.9				7.4

Activity of stock options exercised

		Years Ended December 31,
		2021				2020
Total intrinsic value of stock options exercised		$	9,985,639			$	167,882
Cash received from stock option exercises		$	1,899,561			$	168,065

2004 Plan outstanding and exercisable options by price range

				Options Outstanding												Options Exercisable
	Range of Exercise Prices			Number of Options Outstanding				Weighted Average Remaining Life (Years)				Weighted Average Exercise Price				Number of Options Exercisable				Weighted Average Exercise Price
	$0.95. - $1.25			226,438				2.67			$	1.07				218,730			$	1.07
	$1.50 - $1.90			217,825				5.50			$	1.84				169,826			$	1.84
	$2.00 - $2.32			359,196				6.50			$	2.29				246,921			$	2.28
	$2.36 - $2.75			149,475				5.08			$	2.61				145,725			$	2.61
	$2.92 - $2.93			116,824				6.25			$	2.93				101,650			$	2.93
	$3.70 - $4.49			126,365				5.25			$	4.08				126,365			$	4.08
	$5.00 - $8.58			182,000				9.92			$	6.39				18,292			$	6.47
	$0.95 - $8.58			1,378,123				4.50			$	2.81				1,027,509			$	2.36

Restricted Stock

		Number of Restricted Stocks				Weighted Average Price Per Share
Unvested as of December 31, 2019			110,071			$	1.94
Granted			392,680			$	1.50
Vested			(17,306	)		$	1.94
Forfeited			(43,245	)		$	1.65
Unvested as of December 31, 2020			442,200			$	1.58
Granted			312,112			$	2.89
Vested			(59,659	)		$	1.65
Forfeited			(48,528	)		$	2.00
Unvested as December 31, 2021			646,125			$	3.32

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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