Note 9 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of revenues	$	-	$	-	$	-	$	-
Selling expense		-		-		4		-
Engineering and product development expense		11		3		26		6
General and administrative expense		231		177		608		466
	$	242	$	180	$	638	$	472

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2019		114,750		$	6.92
Granted		132,580			6.31
Vested		(60,474	)		6.60
Forfeited		(12,325	)		7.14
Unvested shares outstanding, September 30, 2019		174,531			6.55

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

	2019			2018
Risk-free interest rate		2.35	%		2.75	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.42			.39
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, 2019 (21,800 exercisable)		264,400		$	7.54
Granted		249,460			6.25
Exercised		-			-
Forfeited		(7,050	)		8.45
Options outstanding, September 30, 2019 (87,900 exercisable)		506,810			6.89