Quarterly Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

			First		Second		Third		Fourth		Fiscal
2013			Quarter		Quarter		Quarter		Quarter		Year
			(in thousands, except per share data)
Revenues		$	26,086	$	26,094	$	25,137	$	27,854	$	105,171
Cost of product revenues			13,826		14,005		13,838		15,806		57,475
	Gross profit		12,260		12,089		11,299		12,048		47,696
Total operating expenses			10,934		11,343		10,885		12,997		46,159
Operating income (loss)			1,326		746		414		(949)		1,537
Other (expense) income, net			(95)		(330)		(358)		(319)		(1,102)
Income (loss) from continuing operations before income taxes			1,231		416		56		(1,268)		435
Income tax expense (benefit)			299		321		105		(1,013)		(288)
Income (loss) from continuing operations			932		95		(49)		(255)		723
Loss from discontinued operations, net of tax			(836)		(281)		(935)		(501)		(2,553)
Net income (loss)		$	96	$	(186)	$	(984)	$	(756)	$	(1,830)
Earnings (loss) per share:
	Basic earnings (loss) per common share from continuing operations	$	0.03	$	0.00	$	0.00	$	(0.01)	$	0.02
	Discontinued operations		(0.03)		(0.01)		(0.03)		(0.01)		(0.08)
	Basic earnings (loss) per common share	$	0.00	$	(0.01)	$	(0.03)	$	(0.02)	$	(0.06)
	Diluted earnings (loss) per common share from continuing operations	$	0.03	$	0.00	$	0.00	$	(0.01)	$	0.02
	Discontinued operations		(0.03)		(0.01)		(0.03)		(0.01)		(0.08)
	Diluted earnings (loss) per common share	$	0.00	$	(0.01)	$	(0.03)	$	(0.02)	$	(0.06)

			First		Second		Third		Fourth		Fiscal
2012			Quarter		Quarter		Quarter		Quarter		Year
			(in thousands, except per share data)
Revenues		$	28,322	$	28,496	$	26,104	$	28,249	$	111,171
Cost of product revenues			14,939		14,901		14,135		14,856		58,831
	Gross profit		13,383		13,595		11,969		13,393		52,340
Total operating expenses			11,321		11,121		10,813		11,255		44,510
Operating income			2,062		2,474		1,156		2,138		7,830
Other (expense) income, net			(385)		(226)		(178)		(149)		(938)
Income from continuing operations before income taxes			1,677		2,248		978		1,989		6,892
Income tax expense			605		698		278		817		2,398
Income from continuing operations			1,072		1,550		700		1,172		4,494
(Loss) income from discontinued operations, net of tax			(543)		(776)		(833)		28		(2,124)
Net income (loss)		$	529	$	774	$	(133)	$	1,200	$	2,370
Earnings per share:
	Basic earnings per common share from continuing operations	$	0.04	$	0.05	$	0.02	$	0.04	$	0.16
	Discontinued operations		(0.02)		(0.03)		(0.03)		0.00		(0.07)
	Basic earnings (loss) per common share	$	0.02	$	0.02	$	(0.01)	$	0.04	$	0.09
	Diluted earnings per common share from continuing operations	$	0.04	$	0.05	$	0.02	$	0.04	$	0.15
	Discontinued operations		(0.02)		(0.03)		(0.03)		0.00		(0.07)
	Diluted earnings (loss) per common share	$	0.02	$	0.02	$	(0.01)	$	0.04	$	0.08