Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 11,847,000	$ 9,741,000	$ 24,638,000	$ 18,232,000
Costs and expenses:
Cost of sales	8,125,000	6,116,000	15,891,000	10,885,000
Selling, general and administrative	4,763,000	5,923,000	9,684,000	11,077,000
Restructuring charge	0	58,000	0	119,000
Research and development	261,000	280,000	549,000	564,000
Intangible assets abandonment and building impairment	317,000	2,965,000	317,000	2,965,000
Costs and expenses:	13,466,000	15,342,000	26,441,000	25,610,000
Operating loss from continuing operations	(1,619,000)	(5,601,000)	(1,803,000)	(7,378,000)
Interest expense	0	0	0	0
Interest income	0	3,000	2,000	6,000
Other expense	(59,000)	(2,000)	(67,000)	(4,000)
Loss from continuing operations before income taxes	(1,678,000)	(5,600,000)	(1,868,000)	(7,376,000)
Income tax (benefit) expense	(1,000)	15,000	(2,000)	15,000
Net loss from continuing operations	(1,679,000)	(5,585,000)	(1,870,000)	(7,361,000)
Loss from discontinued operations (net of income tax benefit of $0 in 2018 and 2017)	(74,000)	(1,269,000)	(99,000)	(1,999,000)
Net loss	$ (1,753,000)	$ (6,854,000)	$ (1,969,000)	$ (9,360,000)
Basic
Continuing operations (in dollars per share)	$ (0.07)	$ (0.24)	$ (0.08)	$ (0.31)
Discontinued operations (in dollars per share)	0.00	(0.05)	0.00	(0.08)
Basic net loss per common share (in dollars per share)	(0.07)	(0.29)	(0.08)	(0.39)
Diluted
Continuing operations (in dollars per share)	(0.07)	(0.24)	(0.08)	(0.31)
Discontinued operations (in dollars per share)	0.00	(0.05)	0.00	(0.08)
Diluted net loss per common share (in dollars per share)	$ (0.07)	$ (0.29)	$ (0.08)	$ (0.39)
Weighted-average number of common shares outstanding:
Basic (in shares)	24,170,000	23,738,000	24,158,000	23,606,000
Diluted (in shares)	24,170,000	23,738,000	24,158,000	23,606,000