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Note 8 - Stock-based Compensation Expense (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Three months ended June 30,								Six months ended June 30,
		2022				2021				2022				2021
Cost of revenue		$	8,440			$	-			$	16,880			$	-
Research and development			13,417				-				26,316				-
Selling and shipping			5,398				-				10,796				-
General and administrative			64,466				62,078				134,839				112,451
Total		$	91,721			$	62,078			$	188,831			$	112,451

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

2007 Share Incentive Plan
		Beginning				Granted				Exercised				Canceled				Ending
		Balance				During				During				During				Balance
		Outstanding				Period				Period				Period				Outstanding				Exercisable
Number of shares			220,000				-				-				(25,000	)			195,000				195,000
Weighted average exercise price per share		$	12.56				-				-			$	15.00			$	12.24			$	12.24

2016 Share Incentive Plan
		Beginning				Granted				Exercised				Canceled				Ending
		Balance				During				During				During				Balance
		Outstanding				Period				Period				Period				Outstanding				Exercisable
Number of shares			398,500				12,500				-				(6,500	)			404,500				102,500
Weighted average exercise price per share		$	4.43			$	4.60				-			$	4.01			$	4.44			$	5.33

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Stock Price		$	4.60
Exercise Price		$	4.60
Dividend yield			0	%
Expected volatility			68	%
Risk-Free interest rate			1.79	%
Expected life (in years)			6.00

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

						Options Outstanding																Options Exercisable
										Weighted				Weighted												Weighted
										Average				Average												Average
Exercise						Number				Remaining				Exercise				Intrinsic				Number				Exercise				Intrinsic
Price Range						Outstanding				Contractual				Price				Value				Exercisable				Price				Value
	$4.00	-	7.00				384,500				8.8			$	4.25			$	0				82,500			$	4.66			$	0
	$7.01	-	10.00				20,000				5.8			$	8.07			$	0				20,000			$	8.07			$	0
	$10.01	-	12.00				120,000				4.7			$	10.52			$	0				120,000			$	10.52			$	0
	$12.01	-	15.00				75,000				.2			$	15.00			$	0				75,000			$	15.00			$	0

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

						Weighted
		Shares of				Average Grant
		Restricted				Date Fair
		Stock Units				Value
Unvested outstanding at December 31, 2021			5,500			$	4.82
Granted			-			$	-
Vested			(5,500	)		$	4.82
Forfeited/Cancelled			-			$	- -
Unvested outstanding at June 30, 2022			-			$	-

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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

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