Note 10 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Cost of revenues	$	-	$	-	$	-	$	-
Selling expense		3		-		9		4
Engineering and product development expense		10		11		31		26
General and administrative expense		72		231		440		608
	$	85	$	242	$	480	$	638

Schedule of Nonvested Share 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		(80,361	)		5.47
Forfeited		(67,125	)		6.03
Unvested shares outstanding, September 30, 2020		246,655			4.89

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

	2020			2019
Risk-free interest rate		0.46	%		2.35	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.44			.42
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, 2020 (87,900 exercisable)		506,810		$	6.89
Granted		113,980			3.49
Exercised		-			-
Forfeited		(182,590	)		6.31
Options outstanding, September 30, 2020 (204,630 exercisable)		438,200			6.25