Business Segments - Summary of company's operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 30,510	$ 32,899
Cost of goods sold, exclusive of depreciation and amortization	(22,416)	(22,874)
Selling, general and administrative	(5,047)	(4,739)
Interest expense	(52)	(56)
Depreciation and amortization	(614)	(592)
Other income, net	14	160
Income (loss) from continuing operations before income tax provision (benefit)	2,395	4,798
Income tax provision (benefit)	748	1,139
Income (loss) from continuing operations	1,647	3,659
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit	(647)	(1,033)
Loss on disposal of QCC and AMP, net of income tax benefit	(680)
Loss from discontinued operation	(1,327)	(1,033)
Net income (loss)	320	2,626
Capital expenditures	885	608
ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	22,000	21,816
Cost of goods sold, exclusive of depreciation and amortization	(15,275)	(14,710)
Selling, general and administrative	(3,319)	(3,034)
Interest expense	(52)	(56)
Depreciation and amortization	(432)	(431)
Other income, net	4	150
Income (loss) from continuing operations before income tax provision (benefit)	2,926	3,735
Income tax provision (benefit)	915	885
Income (loss) from continuing operations	2,011	2,850
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 operation
Net income (loss)	2,011	2,850
Capital expenditures	574	271
CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	8,510	11,083
Cost of goods sold, exclusive of depreciation and amortization	(7,141)	(8,164)
Selling, general and administrative	(1,728)	(1,705)
Interest expense
Depreciation and amortization	(182)	(161)
Other income, net	10	10
Income (loss) from continuing operations before income tax provision (benefit)	(531)	1,063
Income tax provision (benefit)	(167)	254
Income (loss) from continuing operations	(364)	809
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit	(647)	(1,033)
Loss on disposal of QCC and AMP, net of income tax benefit	(680)
Loss from discontinued operation	(1,327)	(1,033)
Net income (loss)	(1,691)	(224)
Capital expenditures	$ 311	$ 337