Note 13 - Stock-based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Years Ended December 31,
	2020		2019
Cost of revenues	$	-	$	-
Selling expense		12		8
Engineering and product development expense		42		35
General and administrative expense		617		841
	$	671	$	884

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

	2020			2019
Risk-free interest rate		0.46	%		2.35	%
Dividend yield		0.00	%		0.00	%
Expected common stock market price volatility factor		.44			.42
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, 2019		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
Granted		113,980			3.49
Exercised		-			-
Canceled		(182,590	)		6.31
Options outstanding, December 31, 2020 (204,630 exercisable)		438,200			6.25

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		132,580			6.31
Vested		(69,974	)		6.60
Forfeited		(12,325	)		7.14
Unvested shares outstanding, December 31, 2019		165,031			6.55
Granted		229,110			4.24
Vested		(89,861	)		5.32
Forfeited		(67,125	)		6.03
Unvested shares outstanding, December 31, 2020		237,155			4.93