Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Summary of Stock-Based Compensation Expense

Year ended December 31	2019		2018
Cost of sales	$	14,000	$	11,000
Selling		121,000		102,000
Marketing		12,000		71,000
General and administrative		275,000		226,000
	$	422,000	$	410,000

Schedule of Weighted Average Assumptions

	2018
Stock Options:
Expected life (years)		6.5
Expected volatility		51	%
Dividend yield		0	%
Risk-free interest rate		2.8	%

	2019			2018
Stock Purchase Plan Options:
Expected life (years)		1.0			1.0
Expected volatility		57	%		66	%
Dividend yield		0	%		0	%
Risk-free interest rate		2.6	%		1.8	%

Summary of Activity Under Stock Option Plans

	Plan Shares Available for Grant			Plan Options Outstanding			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Balance at January 1, 2018		297,000			366,346		$	2.41
Shares reserved		900,000			—
Restricted stock units and awards granted - 2013 Plan		( 178,000	)
Restricted stock units and awards granted - 2018 Plan		( 165,667	)		—
Stock options granted - 2018 Plan		( 119,515	)		119,515			1.95
Stock options exercised		—			( 2,276	)		1.18	$	705
Cancelled or forfeited - 2013 Plan options		51,230			( 51,230	)		2.17
Cancelled or forfeited - 2013 Plan   restricted stock and restricted stock units		39,884			—			1.22
Cancelled or forfeited - 2003 Plan options		—			( 59,428	)		2.09
Balance at December 31, 2018		824,932			372,927			2.36
Restricted stock units and awards granted - 2018 Plan		( 70,755	)		—
Cancelled or forfeited - 2018 Plan options		13,570			( 13,570	)		1.95
Cancelled or forfeited - 2018 Plan   restricted stock and restricted stock units		13,570			—			1.95
Cancelled or forfeited - 2013 Plan options		20,492			( 20,492	)		2.10
Cancelled or forfeited - 2013 Plan   restricted stock and restricted stock units		21,748			—			1.72
Cancelled or forfeited - 2003 Plan options		—			( 41,666	)		2.46
Balance at December 31, 2019		823,557			297,199			2.38

Schedule Of The Number Of Options Exercisable

December 31 2019	191,254
December 31 2018	253,412

Summary Of Information About Stock Options Outstanding

Options Outstanding
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
$	1.18 - $2.04		148,291	6.93 years	$	1.74		42,346	$	1.22
$	2.05 - $3.09		106,557	3.05 years		2.61		106,557		2.61
$	4.02		42,351	0.40 years		4.02		42,351		4.02
			297,199	4.61 years	$	2.38		191,254	$	2.61

Summary of Restricted Stock and Restricted Stock Units

	Number of Shares			Weighted average grant date fair value
Unvested shares at January 1, 2018		322,479		$	1.69
Granted		343,667			1.86
Vested		(132,940	)		1.47
Forfeited or surrendered		(39,884	)		1.22
Unvested shares at December 31, 2018		493,322		$	1.90
Granted		70,755			1.06
Vested		(210,742	)		1.59
Forfeited or surrendered		(37,973	)		1.84
Unvested shares at December 31, 2019		315,362		$	1.92