Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Summary of Stock-Based Compensation Expense

Year ended December 31	2018		2017
Cost of sales	$	11,000	$	52,000
Selling		102,000		75,000
Marketing		71,000		51,000
General and administrative		226,000		209,000
	$	410,000	$	387,000

Schedule of Weighted Average Assumptions

	2018			2017
Stock Options:
Expected life (years)		6.5			2.0
Expected volatility		51	%		46	%
Dividend yield		0	%		0	%
Risk-free interest rate		2.8	%		1.0	%

	2018			2017
Stock Purchase Plan Options:
Expected life (years)		1.0			1.0
Expected volatility		66	%		51	%
Dividend yield		0	%		0	%
Risk-free interest rate		1.8	%		0.9	%

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, 2017		501,622			419,162		$	3.18
Shares reserved		—			—
Options granted for modification		(61,814	)		150,474
Stock awards granted		(72,115	)		—
Restricted stock units and awards granted		(203,424	)		—
Stock options granted		—			—
Stock options exercised		—			—
Cancelled or forfeited - 2013 Plan options		103,349			(103,349	)		2.20
Cancelled or forfeited - 2013 Plan   restricted stock and restricted stock units		29,382			—			2.01
Cancelled or forfeited - 2003 Plan options		—			(99,941	)		2.20
Balance at December 31, 2017		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

Schedule Of The Number Of Options Exercisable

December 31, 2018	253,412
December 31, 2017	366,346

Summary Of Information About 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
$	1.18 - $2.04		179,620		7.73 years	$	1.77		60,105	$	1.4
$	2.05 - $3.09		144,125		3.43 years		2.52		144,125		2.52
$	4.02		49,182		1.4 years		4.02		49,182		4.02
			372,927		5.23 years	$	2.36		253,412	$	2.55

Summary of Restricted Stock and Restricted Stock Units

	Number of Shares			Weighted average grant date fair value
Unvested shares at January 1, 2017		204,875		$	2.16
Granted		203,424			1.12
Vested		(56,438	)		1.05
Forfeited or surrendered		(29,382	)		2.01
Unvested shares at December 31, 2017		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