Business Segments - Summary of company's operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 6,990	$ 7,342
Cost of goods sold, exclusive of depreciation and amortization	(5,438)	(5,697)
Selling, general and administrative	(1,576)	(1,299)
Interest expense	(9)	(10)
Depreciation and amortization	(169)	(153)
Other income, net	1	1
(Loss) income before income tax provision	(201)	184
Income tax (benefit) provision	(56)	7
Net (loss) income	(145)	177
Capital expenditures	418	478
Operating Segments
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	6,990	7,342
Cost of goods sold, exclusive of depreciation and amortization	(5,438)	(5,697)
Selling, general and administrative	(1,576)	(1,299)
Interest expense	(9)	(10)
Depreciation and amortization	(169)	(153)
Other income, net	1	1
(Loss) income before income tax provision	(201)	184
Income tax (benefit) provision	(56)	7
Net (loss) income	(145)	177
Capital expenditures	418	478
Operating Segments | ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	5,305	5,383
Cost of goods sold, exclusive of depreciation and amortization	(3,840)	(3,986)
Selling, general and administrative	(1,140)	(889)
Interest expense	(9)	(10)
Depreciation and amortization	(122)	(108)
Other income, net
(Loss) income before income tax provision	194	390
Income tax (benefit) provision	54	60
Net (loss) income	140	330
Capital expenditures	372	384
Operating Segments | CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	1,685	1,959
Cost of goods sold, exclusive of depreciation and amortization	(1,598)	(1,711)
Selling, general and administrative	(436)	(410)
Interest expense
Depreciation and amortization	(47)	(45)
Other income, net	1	1
(Loss) income before income tax provision	(395)	(206)
Income tax (benefit) provision	(110)	(53)
Net (loss) income	(285)	(153)
Capital expenditures	$ 46	$ 94