Note 9 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	201 9		201 8		201 9		201 8
Cost of revenues	$	-	$	-	$	-	$	-
Selling expense		4		-		4		-
Engineering and product development expense		12		2		15		3
General and administrative expense		197		169		377		289
	$	213	$	171	$	396	$	292

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		115,680			6.57
Vested		(43,724	)		6.90
Forfeited		(12,325	)		7.14
Unvested shares outstanding, June 30, 2019		174,381			6.68

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

	201 9			201 8
Risk-free interest rate		2.38	%		2.74	%
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		239,160			6.32
Exercised		-			-
Forfeited		(7,050	)		8.45
Options outstanding, June 30, 2019 (84,550 exercisable)		496,510			6.94