Note 10 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenues	$	-	$	1	$	-	$	5
Selling expense		-		-		-		-
Engineering and product development expense		3		1		6		5
General and administrative expense		177		104		466		282
	$	180	$	106	$	472	$	292

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2018		75,225		$	5.29
Granted		95,600			8.24
Vested		(47,575	)		6.96
Forfeited		-			-
Unvested shares outstanding, September 30, 2018		123,250			7.02

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

	201 8			201 7
Risk-free interest rate		2.75	%		2.14	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.39			.39
Weighted average expected life of stock options (years)		6.25			6.25

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Shares		Weighted Average Grant Date Fair Value
Options outstanding, January 1, 2018 (4,950 exercisable)		76,400	$	5.98
Granted		189,800		8.14
Exercised		-		-
Forfeited		-		-
Options outstanding, September 30, 2018 (22,700 exercisable)		266,200		7.52