Note 14 - Stock-based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	Years Ended December 31,
	2018		2017
Cost of revenues	$	-	$	6
Selling expense		-		-
Engineering and product development expense		9		5
General and administrative expense		645		333
	$	654	$	344

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

	2018			2017
Risk-free interest rate		2.75	%		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 Exercise Price
Options outstanding, January 1, 2017		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
Granted		189,800			8.14
Exercised		-			-
Canceled		(1,800	)		4.37
Options outstanding, December 31, 2018 (21,800 exercisable)		264,400			7.54

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2017		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
Granted		95,600			8.24
Vested		(56,075	)		7.18
Forfeited		-			-
Unvested shares outstanding, December 31, 2018		114,750			6.92