Note 15 - Stock-based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	Years Ended December 31,
	2021		2020
Cost of revenues	$	26	$	-
Selling expense		22		12
Engineering and product development expense		62		42
General and administrative expense		1,340		617
	$	1,450	$	671

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

	2021			2020
Risk-free interest rate		1.03	%		0.46	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.50			.44
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, 2020		506,810			6.89
Granted		113,980			3.49
Exercised		-			-
Canceled		(182,590	)		6.31
Options outstanding, December 31, 2020 (204,630 exercisable)		438,200			6.25
Granted		282,404			11.77
Exercised		(231,185	)		6.85
Canceled		(80,550	)		9.55
Options outstanding, December 31, 2021 (59,195 exercisable)		408,869			9.07

Nonvested Restricted Stock Shares Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2020		165,031			6.55
Granted		229,110			4.24
Vested		(89,861	)		5.32
Forfeited		(67,125	)		6.03
Unvested shares outstanding, December 31, 2020		237,155			4.93
Granted		131,209			11.74
Vested		(87,706	)		7.59
Forfeited		(18,125	)		9.02
Unvested shares outstanding, December 31, 2021		262,533			7.16