Note 12 - Stock-based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Years Ended December 31,
	2019		2018
Cost of revenues	$	-	$	-
Selling expense		8		-
Engineering and product development expense		35		9
General and administrative expense		841		645
	$	884	$	654

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

	2019			2018
Risk-free interest rate		2.35	%		2.75	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.42			.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 Exercise Price
Options outstanding, January 1, 2018		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
Granted		249,460			6.25
Exercised		-			-
Canceled		(7,050	)		8.45
Options outstanding, December 31, 2019 (87,900 exercisable)		506,810			6.89

Schedule of Nonvested Share Activity [Table Text Block]

	Number of Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding, January 1, 2018		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
Granted		132,580			6.31
Vested		(69,974	)		6.60
Forfeited		(12,325	)		7.14
Unvested shares outstanding, December 31, 2019		165,031			6.55