Business Segments - Summary of company's operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	$ 8,067	$ 7,719	$ 15,409	$ 15,786
Cost of goods sold, exclusive of depreciation and amortization	(5,873)	(5,286)	(11,570)	(11,545)
Selling, general and administrative	(1,335)	(1,220)	(2,634)	(2,478)
Interest expense	(11)	(12)	(21)	(23)
Depreciation and amortization	(155)	(149)	(308)	(296)
Other income, net		2	1	10
Income from continuing operations before income tax provision	693	1,054	877	1,454
Income tax provision (benefit)	189	309	196	428
Income from continuing operations	504	745	681	1,026
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit		(197)		(409)
Loss on disposal of QCC and AMP, net of income tax benefit		(268)		(268)
Loss from discontinued operations		(465)		(677)
Net income (loss)	504	280	681	349
Capital expenditures			989	136
Operating Segments
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	8,067	7,719	15,409	15,786
Cost of goods sold, exclusive of depreciation and amortization	(5,873)	(5,286)	(11,570)	(11,545)
Selling, general and administrative	(1,335)	(1,220)	(2,634)	(2,478)
Interest expense	(11)	(12)	(21)	(23)
Depreciation and amortization	(155)	(149)	(308)	(296)
Other income, net		2	1	10
Income from continuing operations before income tax provision	693	1,054	877	1,454
Income tax provision (benefit)	189	309	196	428
Income from continuing operations	504	745	681	1,026
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit		(197)		(409)
Loss on disposal of QCC and AMP, net of income tax benefit		(268)		(268)
Loss from discontinued operations		(465)		(677)
Net income (loss)	504	280	681	349
Capital expenditures	511	49	989	136
Operating Segments | ATG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	5,806	5,587	11,189	10,889
Cost of goods sold, exclusive of depreciation and amortization	(4,121)	(3,584)	(8,107)	(7,365)
Selling, general and administrative	(908)	(838)	(1,798)	(1,569)
Interest expense	(11)	(12)	(21)	(23)
Depreciation and amortization	(111)	(110)	(219)	(219)
Other income, net				4
Income from continuing operations before income tax provision	655	1,043	1,044	1,717
Income tax provision (benefit)	181	302	241	498
Income from continuing operations	474	741	803	1,219
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit
Loss on disposal of QCC and AMP, net of income tax benefit
Loss from discontinued operations
Net income (loss)	474	741	803	1,219
Capital expenditures	429	43	813	93
Operating Segments | CPG
Segment Reporting Information [Line Items]
Revenues from unaffiliated customers	2,261	2,132	4,220	4,897
Cost of goods sold, exclusive of depreciation and amortization	(1,752)	(1,702)	(3,463)	(4,180)
Selling, general and administrative	(427)	(382)	(836)	(909)
Interest expense
Depreciation and amortization	(44)	(39)	(89)	(77)
Other income, net		2	1	6
Income from continuing operations before income tax provision	38	11	(167)	(263)
Income tax provision (benefit)	8	7	(45)	(70)
Income from continuing operations	30	4	(122)	(193)
Discontinued Operations:
Loss from operations of a discontinued component, net of income tax benefit		(197)		(409)
Loss on disposal of QCC and AMP, net of income tax benefit		(268)		(268)
Loss from discontinued operations		(465)		(677)
Net income (loss)	30	(461)	(122)	(870)
Capital expenditures	$ 82	$ 6	$ 176	$ 43