Business Segments - Summary of company's operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 8,031	$ 7,727	$ 23,016	$ 23,136
Cost of goods sold, exclusive of depreciation and amortization	(6,125)	(5,594)	(17,413)	(17,164)
Selling, general and administrative	(1,262)	(1,506)	(4,181)	(4,140)
Interest expense	(12)	(10)	(31)	(31)
Arbitration award expense	(5,419)		(5,419)
Depreciation and amortization	(150)	(152)	(490)	(460)
Other income, net	4	44	16	45
Income (loss) before income tax provision (benefit)	(4,933)	509	(4,502)	1,386
Income tax (benefit) provision	(1,632)	151	(1,503)	347
Net (loss) income	(3,301)	358	(2,999)	1,039
Capital expenditures			1,777	1,124
Operating Segments
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	8,031	7,727	23,016	23,136
Cost of goods sold, exclusive of depreciation and amortization	(6,125)	(5,594)	(17,413)	(17,164)
Selling, general and administrative	(1,262)	(1,506)	(4,181)	(4,140)
Interest expense	(12)	(10)	(31)	(31)
Arbitration award expense	(5,419)		(5,419)
Depreciation and amortization	(150)	(152)	(490)	(460)
Other income, net	4	44	16	45
Income (loss) before income tax provision (benefit)	(4,933)	509	(4,502)	1,386
Income tax (benefit) provision	(1,632)	151	(1,503)	347
Net (loss) income	(3,301)	358	(2,999)	1,039
Capital expenditures	900	135	1,777	1,124
Operating Segments | ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	6,443	5,520	18,002	16,709
Cost of goods sold, exclusive of depreciation and amortization	(4,471)	(3,871)	(12,658)	(11,978)
Selling, general and administrative	(914)	(1,088)	(3,096)	(2,886)
Interest expense	(12)	(10)	(31)	(31)
Arbitration award expense	(5,419)		(5,419)
Depreciation and amortization	(106)	(109)	(351)	(328)
Other income, net	3	1	13	1
Income (loss) before income tax provision (benefit)	(4,476)	443	(3,540)	1,487
Income tax (benefit) provision	(1,462)	134	(1,183)	375
Net (loss) income	(3,014)	309	(2,357)	1,112
Capital expenditures	149	107	602	920
Operating Segments | CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	1,588	2,207	5,014	6,427
Cost of goods sold, exclusive of depreciation and amortization	(1,654)	(1,723)	(4,755)	(5,186)
Selling, general and administrative	(348)	(418)	(1,085)	(1,254)
Interest expense
Arbitration award expense
Depreciation and amortization	(44)	(43)	(139)	(132)
Other income, net	1	43	3	44
Income (loss) before income tax provision (benefit)	(457)	66	(962)	(101)
Income tax (benefit) provision	(170)	17	(320)	(28)
Net (loss) income	(287)	49	(642)	(73)
Capital expenditures	$ 751	$ 28	$ 1,175	$ 204