Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

Stock-based compensation expense

Year ended December 31	2020			2019
Cost of sales	$	5,000		$	14,000
Selling		38,000			121,000
Marketing		(1,000	)		12,000
General and administrative		130,000			275,000
	$	172,000		$	422,000

Weighted average assumptions

	2020			2019
Stock Purchase Plan Options:
Expected life (years)		1.0			1.0
Expected volatility		59	%		57	%
Dividend yield		0	%		0	%
Risk-free interest rate		1.6	%		2.6	%

Stock option activity

	Plan Shares Available for Grant			Plan Options Outstanding			Weighted Average Exercise Price Per Share
Balance at January 1, 2019		117,860			53,225		$	16.49
Restricted stock units and awards granted - 2018 Plan		( 10,106	)		—
Cancelled or forfeited - 2018 Plan options		1,938			( 1,938	)		13.65
Cancelled or forfeited - 2018 Plan restricted stock and restricted stock units		1,938			—			13.65
Cancelled or forfeited - 2013 Plan options		2,926			( 2,926	)		14.70
Cancelled or forfeited - 2013 Plan restricted stock and restricted stock units		3,105			—			12.02
Cancelled or forfeited - 2003 Plan options		—			( 5,945	)		17.21
Balance at December 31, 2019		117,661			42,416			16.66
Restricted stock units and awards granted - 2018 Plan		( 31,782	)		—
Cancelled or forfeited - 2018 Plan options		1,070			( 1,070	)		13.65
Cancelled or forfeited - 2018 Plan restricted stock and restricted stock units		3,091			—			9.58
Cancelled or forfeited - 2013 Plan options		2,241			( 2,241	)		15.54
Cancelled or forfeited - 2013 Plan restricted stock and restricted stock units		1,450			—			13.34
Cancelled or forfeited - 2003 Plan options		—			( 8,607	)		24.23
Balance at December 31, 2020		93,731			30,498		$	14.69

Stock options outstanding

	Options Outstanding					Options Exercisable
Ranges of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life	Weighted Average Exercise Price Per Share		Number Exercisable		Weighted Average Exercise Price Per Share
$8.26 - $13.65		18,799	6.12 years	$	12.36		9,424	$	11.07
$15.54 - $21.63		11,699	1.97 years		18.43		11,699		18.43
		30,498	4.53 years	$	14.69		21,123	$	15.15

Restricted stock and restricted stock unit activity

	Number of Shares			Weighted average grant date fair value
Unvested shares at January 1, 2019		70,078		$	12.47
Granted		10,106			7.42
Vested		(30,103	)		11.15
Forfeited or surrendered		(5,422	)		12.88
Unvested shares at December 31, 2019		44,659		$	12.16
Granted		31,782			6.00
Vested		(22,315	)		11.36
Forfeited or surrendered		(4,162	)		10.30
Unvested shares at December 31, 2020		49,964		$	8.76