Business Segments - Summary of company's operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 7,727	$ 7,516	$ 23,136	$ 23,302
Cost of goods sold, exclusive of depreciation and amortization	(5,594)	(5,536)	(17,164)	(17,081)
Selling, general and administrative	(1,506)	(1,275)	(4,140)	(3,753)
Interest expense	(10)	(11)	(31)	(34)
Depreciation and amortization	(152)	(141)	(460)	(437)
Other income, net	44	2	45	12
Income (loss) from continuing operations before income tax provision	509	555	1,386	2,009
Income tax provision (benefit)	151	249	347	663
Income (loss) from continuing operations	358	306	1,039	1,346
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit		(188)		(591)
Loss on disposal of QCC and AMP, net of income tax benefit		(262)		(530)
Loss from discontinued operations		(450)		(1,121)
Net income (loss)	358	(144)	1,039	225
Capital expenditures			1,124	394
Operating Segments
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	7,727	7,516	23,136	23,302
Cost of goods sold, exclusive of depreciation and amortization	(5,594)	(5,536)	(17,164)	(17,081)
Selling, general and administrative	(1,506)	(1,275)	(4,140)	(3,753)
Interest expense	(10)	(11)	(31)	(34)
Depreciation and amortization	(152)	(141)	(460)	(437)
Other income, net	44	2	45	12
Income (loss) from continuing operations before income tax provision	509	555	1,386	2,009
Income tax provision (benefit)	151	249	347	663
Income (loss) from continuing operations	358	306	1,039	1,346
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit		(188)		(591)
Loss on disposal of QCC and AMP, net of income tax benefit		(262)		(530)
Loss from discontinued operations		(450)		(1,121)
Net income (loss)	358	(144)	1,039	225
Capital expenditures	135	258	1,124	394
Operating Segments | ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	5,520	5,783	16,709	16,671
Cost of goods sold, exclusive of depreciation and amortization	(3,871)	(4,080)	(11,978)	(11,445)
Selling, general and administrative	(1,088)	(842)	(2,886)	(2,411)
Interest expense	(10)	(11)	(31)	(34)
Depreciation and amortization	(109)	(104)	(328)	(323)
Other income, net	1		1	5
Income (loss) from continuing operations before income tax provision	443	746	1,487	2,463
Income tax provision (benefit)	134	335	375	812
Income (loss) from continuing operations	309	411	1,112	1,651
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit
Loss on disposal of QCC and AMP, net of income tax benefit
Loss from discontinued operations
Net income (loss)	309	411	1,112	1,651
Capital expenditures	107	234	920	327
Operating Segments | CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	2,207	1,733	6,427	6,631
Cost of goods sold, exclusive of depreciation and amortization	(1,723)	(1,456)	(5,186)	(5,636)
Selling, general and administrative	(418)	(433)	(1,254)	(1,342)
Interest expense
Depreciation and amortization	(43)	(37)	(132)	(114)
Other income, net	43	2	44	7
Income (loss) from continuing operations before income tax provision	66	(191)	(101)	(454)
Income tax provision (benefit)	17	(86)	(28)	(149)
Income (loss) from continuing operations	49	(105)	(73)	(305)
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit		(188)		(591)
Loss on disposal of QCC and AMP, net of income tax benefit		(262)		(530)
Loss from discontinued operations		(450)		(1,121)
Net income (loss)	49	(555)	(73)	(1,426)
Capital expenditures	$ 28	$ 24	$ 204	$ 67