Note 9 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	20 20		201 9		20 20		201 9
Cost of revenues	$	-	$	-	$	-	$	-
Selling expense		3		4		6		4
Engineering and product development expense		11		12		21		15
General and administrative expense		194		197		368		377
	$	208	$	213	$	395	$	396

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2020		165,031		$	6.55
Granted		74,000			3.59
Vested		(61,636	)		4.90
Forfeited		(15,065	)		5.02
Unvested shares outstanding, June 30, 2020		162,330			5.61

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

	2020			2019
Risk-free interest rate		0.46	%		2.38	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.44			.41
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, 2020 (87,900 exercisable)		506,810		$	6.89
Granted		113,980			3.49
Exercised		-			-
Forfeited		(27,140	)		6.30
Options outstanding, June 30, 2020 (202,055 exercisable)		593,650			6.26