Note 9 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

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

	Three Months Ended March 31,
	201 9		201 8
Cost of revenues	$	-	$	-
Selling expense		-		-
Engineering and product development expense		3		1
General and administrative expense		180		120
	$	183	$	121

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		80,300			7.13
Vested		(34,000	)		6.82
Forfeited		-			-
Unvested shares outstanding, March 31, 2019		161,050			7.04

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

	201 9			201 8
Risk-free interest rate		2.49	%		2.70	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.41			.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		132,600		7.13
Exercised		-		-
Forfeited		-		-
Options outstanding, March 31, 2019 (75,625 exercisable)		397,000		7.40