Business Segments - Summary of company's operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 36,729	$ 31,646
Cost of goods sold, exclusive of depreciation and amortization	(27,641)	(24,525)
Selling, general and administrative	(6,162)	(5,580)
Interest expense	(70)	(47)
Arbitration award expense	(50)	(5,597)
Depreciation and amortization	(718)	$ (652)
Insurance proceeds - arbitration	4,500
Other income, net	140	$ 16
Income (loss) before income tax provision (benefit)	6,728	(4,739)
Income tax provision (benefit)	2,131	(1,613)
Net (loss) income	4,597	(3,126)
Total assets	34,374	35,245
Capital expenditures	1,132	3,154
Operating Segments
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	36,729	31,646
Cost of goods sold, exclusive of depreciation and amortization	(27,641)	(24,525)
Selling, general and administrative	(6,162)	(5,580)
Interest expense	(70)	(47)
Arbitration award expense	(50)	(5,597)
Depreciation and amortization	(718)	$ (652)
Insurance proceeds - arbitration	4,500
Other income, net	140	$ 16
Income (loss) before income tax provision (benefit)	6,728	(4,739)
Income tax provision (benefit)	2,131	(1,613)
Net (loss) income	4,597	(3,126)
Total assets	34,374	35,245
Capital expenditures	1,132	3,154
Operating Segments | ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	28,596	25,021
Cost of goods sold, exclusive of depreciation and amortization	(20,390)	(17,983)
Selling, general and administrative	(4,492)	(4,097)
Interest expense	(40)	(40)
Arbitration award expense	(50)	(5,597)
Depreciation and amortization	(493)	$ (468)
Insurance proceeds - arbitration	4,500
Other income, net	139	$ 13
Income (loss) before income tax provision (benefit)	7,770	(3,151)
Income tax provision (benefit)	2,462	(1,072)
Net (loss) income	5,308	(2,079)
Total assets	22,789	23,092
Capital expenditures	903	803
Operating Segments | CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	8,133	6,625
Cost of goods sold, exclusive of depreciation and amortization	(7,251)	(6,542)
Selling, general and administrative	(1,670)	(1,483)
Interest expense	$ (30)	$ (7)
Arbitration award expense
Depreciation and amortization	$ (225)	$ (184)
Insurance proceeds - arbitration
Other income, net	$ 1	$ 3
Income (loss) before income tax provision (benefit)	(1,042)	(1,588)
Income tax provision (benefit)	(331)	(541)
Net (loss) income	(711)	(1,047)
Total assets	11,585	12,153
Capital expenditures	$ 229	$ 2,351