Note 10 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of revenues	$	-	$	1	$	-	$	4
Selling expense		-		-		-		-
Engineering and product development expense		2		1		3		4
General and administrative expense		169		96		289		178
	$	171	$	98	$	292	$	186

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		91,100			8.29
Vested		(31,700	)		7.09
Forfeited		-			-
Unvested shares outstanding, June 30, 2018		134,625			6.98

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

	2018			2017
Risk-free interest rate		2.74	%		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		176,400		8.21
Exercised		-		-
Forfeited		-		-
Options outstanding, June 30, 2018 (22,700 exercisable)		252,800		7.53