Note 13 - Stock-based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

	Years Ended December 31,
	2017		2016
Cost of revenues	$	6	$	10
Selling expense		-		6
Engineering and product development expense		5		11
General and administrative expense		333		242
	$	344	$	269

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

	2017			2016
Risk-free interest rate		2.14	%		1.30	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.39			.40
Weighted average expected life of stock options (years)		6			4

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Shares			Weighted Average Exercise Price
Options outstanding, January 1, 2016		-		$	-
Granted		19,800			4.37
Exercised		-			-
Canceled		-			-
Options outstanding, December 31, 2016 (none exercisable)		19,800			4.37
Granted		96,000			6.35
Exercised		-			-
Canceled		(39,400	)		6.08
Options outstanding, December 31, 2017 (4,950 exercisable)		76,400			5.98

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2016		63,750			3.64
Granted		86,400			4.27
Vested		(53,125	)		3.94
Forfeited		-			-
Unvested shares outstanding, December 31, 2016		97,025			4.04
Granted		66,000			6.54
Vested		(69,100	)		4.65
Forfeited		(18,700	)		5.59
Unvested shares outstanding, December 31, 2017		75,225			5.29