Note 10 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Cost of revenues	$	10	$	-	$	17	$	-
Selling expense		8		3		17		9
Engineering and product development expense		17		10		43		31
General and administrative expense		336		72		1,017		440
	$	371	$	85	$	1,094	$	480

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2021		237,155		$	4.93
Granted		126,209			11.74
Vested		(78,206	)		7.24
Forfeited		(18,125	)		9.02
Unvested shares outstanding, September 30, 2021		267,033			7.19

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 Grant Date Fair Value
Options outstanding, January 1, 2021 (204,630 exercisable)		438,200		$	6.25
Granted		282,404			11.77
Exercised		(149,010	)		6.84
Forfeited		(80,550	)		9.55
Options outstanding, September 30, 2021 (141,370 exercisable)		491,044			8.70