Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Shareholders' Equity

Stock-based compensation expense

Year ended December 31	2021		2020
Cost of sales	$	24,000	$	5,000
Selling		25,000		38,000
Marketing		12,000		(1,000	)
General and administrative		171,000		130,000
	$	232,000	$	172,000

Weighted average assumptions

	2021			2020
Stock Purchase Plan Options:
Expected life (years)		1.0			1.0
Expected volatility		142	%		59	%
Dividend yield		0	%		0	%
Risk-free interest rate		0.1	%		1.6	%

Stock option activity

	Plan Shares Available for Grant			Plan Options Outstanding			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Balance at January 1, 2020		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
Restricted stock units and awards granted - 2018 Plan		(5,514	)		—
Cancelled or forfeited - 2018 Plan options		2,584			(2,584	)		13.36
Cancelled or forfeited - 2018 Plan restricted stock and restricted stock units		5,508			—			8.69
Stock options exercised		—			(1,973	)		13.59	$	17,100
Cancelled or forfeited - 2013 Plan options		292			(292	)		15.54
Cancelled or forfeited - 2013 Plan restricted stock and restricted stock units		1,047			—			12.39
Cancelled or forfeited - 2003 Plan options		—			(6,527	)		19.66
Balance at December 31, 2021		97,648			19,122		$	13.23

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		13,759		5.07	years	$	12.33		10,363	$	11.90
$15.54 - $21.63		5,363		2.39	years		15.54		5,363		15.54
		19,122		4.32	years	$	13.23		15,726	$	13.14

Restricted stock and restricted stock unit activity

	Number of Shares			Weighted average grant date fair value
Unvested shares at January 1, 2020		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
Granted		5,514			8.16
Vested		(40,392	)		8.33
Forfeited or surrendered		(6,555	)		9.28
Unvested shares at December 31, 2021		8,531		$	10.01