Note 13 - Stock-based Compensation Plan (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Cost of revenues	$	18	$	10	$	44	$	17
Selling expense		9		8		23		17
Engineering and product development expense		6		17		43		43
General and administrative expense		417		336		1,263		1,017
	$	450	$	371	$	1,373	$	1,094

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

	2022			2021
Risk-free interest rate		2.05	%		1.03	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.55			.50
Weighted average expected life of stock options (years)		6.25			6.25

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

	Number of Shares			Weighted Average Exercise Price
Options outstanding, January 1, 2022 (59,195 exercisable)		408,869			9.07
Granted		202,540			8.45
Exercised		(8,060	)		4.74
Canceled		(22,930	)		9.10
Options outstanding, September 30, 2022 (167,886 exercisable)		580,419			8.91

Nonvested Restricted Stock Shares Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2022		262,533			7.16
Granted		123,533			9.21
Vested		(82,672	)		7.85
Forfeited		(5,944	)		9.16
Unvested shares outstanding, September 30, 2022		297,450			7.86