Note 10 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

	Three Months Ended March 31,
	2018		2017
Cost of revenues	$	-	$	3
Selling expense		-		-
Engineering and product development expense		1		3
General and administrative expense		120		82
	$	121	$	88

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		79,200			8.45
Vested		(21,200	)		6.92
Forfeited		-			-
Unvested shares outstanding, March 31, 2018		133,225			6.99

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

	201 8			201 7
Risk-free interest rate		2.70	%		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		140,700		8.45
Exercised		-		-
Forfeited		-		-
Options outstanding, March 31, 2018 (22,700 exercisable)		217,100		7.58