Business Segments - Summary of company's operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 8,947	$ 8,171
Cost of goods sold, exclusive of depreciation and amortization	(6,716)	(6,476)
Selling, general and administrative	(1,636)	(1,765)
Depreciation and amortization	(207)	(163)
Interest expense	(19)	(21)
Arbitration award expense		(50)
Insurance proceeds - arbitration		4,500
Other income, net		2
Income (loss) before income tax provision (benefit)	369	4,198
Income tax provision (benefit)	111	1,427
Net income	258	2,771
Capital expenditures	178	281
Operating Segments
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	8,947	8,171
Cost of goods sold, exclusive of depreciation and amortization	(6,716)	(6,476)
Selling, general and administrative	(1,636)	(1,765)
Depreciation and amortization	(207)	(163)
Interest expense	$ (19)	(21)
Arbitration award expense		4,500
Insurance proceeds - arbitration		(50)
Other income, net		2
Income (loss) before income tax provision (benefit)	$ 369	4,198
Income tax provision (benefit)	111	1,427
Net income	258	2,771
Capital expenditures	178	281
Operating Segments | ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	7,110	6,353
Cost of goods sold, exclusive of depreciation and amortization	(5,169)	(4,751)
Selling, general and administrative	(1,132)	(1,359)
Depreciation and amortization	(140)	(117)
Interest expense	$ (11)	(13)
Arbitration award expense		4,500
Insurance proceeds - arbitration		(50)
Other income, net		2
Income (loss) before income tax provision (benefit)	$ 658	4,565
Income tax provision (benefit)	198	1,552
Net income	460	3,013
Capital expenditures	139	188
Operating Segments | CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	1,837	1,818
Cost of goods sold, exclusive of depreciation and amortization	(1,547)	(1,725)
Selling, general and administrative	(504)	(406)
Depreciation and amortization	(67)	(46)
Interest expense	$ (8)	$ (8)
Arbitration award expense
Insurance proceeds - arbitration
Other income, net
Income (loss) before income tax provision (benefit)	$ (289)	$ (367)
Income tax provision (benefit)	(87)	(125)
Net income	(202)	(242)
Capital expenditures	$ 39	$ 93