Business Segments - Summary of company's operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 31,646	$ 30,310
Cost of goods sold, exclusive of depreciation and amortization	(24,525)	(22,799)
Selling, general and administrative	(5,580)	(5,638)
Interest expense	(47)	(41)
Arbitration award expense	(5,597)
Depreciation and amortization	(652)	(640)
Other income, net	16	42
Income (loss) before income tax provision (benefit)	(4,739)	1,234
Income tax (benefit) provision	(1,613)	259
Net (loss) income	(3,126)	975
Capital expenditures	3,154	1,563
Operating Segments
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	31,646	30,310
Cost of goods sold, exclusive of depreciation and amortization	(24,525)	(22,799)
Selling, general and administrative	(5,580)	(5,638)
Interest expense	(47)	(41)
Arbitration award expense	(5,597)
Depreciation and amortization	(652)	(640)
Other income, net	16	42
Income (loss) before income tax provision (benefit)	(4,739)	1,234
Income tax (benefit) provision	(1,613)	259
Net (loss) income	(3,126)	975
Capital expenditures	3,154	1,563
Operating Segments | ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	25,021	22,204
Cost of goods sold, exclusive of depreciation and amortization	(17,983)	(16,155)
Selling, general and administrative	(4,097)	(3,985)
Interest expense	(40)	(41)
Arbitration award expense	(5,597)
Depreciation and amortization	(468)	(452)
Other income, net	13	(2)
Income (loss) before income tax provision (benefit)	(3,151)	1,569
Income tax (benefit) provision	(1,072)	329
Net (loss) income	(2,079)	1,240
Capital expenditures	803	1,191
Operating Segments | CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	6,625	8,106
Cost of goods sold, exclusive of depreciation and amortization	(6,542)	(6,644)
Selling, general and administrative	(1,483)	(1,653)
Interest expense	(7)
Arbitration award expense
Depreciation and amortization	(184)	(188)
Other income, net	3	44
Income (loss) before income tax provision (benefit)	(1,588)	(335)
Income tax (benefit) provision	(541)	(70)
Net (loss) income	(1,047)	(265)
Capital expenditures	$ 2,351	$ 372