Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Financial information by business segment
Net sales	$ 27,672	$ 34,454	$ 83,174	$ 85,753
Cost of sales	19,893	24,155	58,949	61,430
Gross profit	7,779	10,299	24,225	24,323
Selling, general and administrative expense	7,475	7,952	22,315	21,847
Earnings from operations	304	2,347	1,910	2,476
Interest expense	(277)	(272)	(765)	(795)
Other income (expense)	336	(899)	685	(738)
Earnings before income taxes	363	1,176	1,830	943
Tax provision (benefit)	(201)	(202)	25	(133)
Net earnings	564	1,378	1,805	1,076
COBRA [Member]
Financial information by business segment
Net sales	23,962	30,907	72,071	74,428
Cost of sales	17,494	21,886	51,901	53,949
Gross profit	6,468	9,021	20,170	20,479
Selling, general and administrative expense	6,202	6,749	18,631	18,141
Earnings from operations	266	2,272	1,539	2,338
Interest expense	(277)	(272)	(765)	(795)
Other income (expense)	315	(662)	632	(594)
Earnings before income taxes	304	1,338	1,406	949
Tax provision (benefit)	41	32	296	230
Net earnings	263	1,306	1,110	719
PPL [Member]
Financial information by business segment
Net sales	3,710	3,547	11,103	11,325
Cost of sales	2,399	2,269	7,048	7,481
Gross profit	1,311	1,278	4,055	3,844
Selling, general and administrative expense	1,273	1,203	3,684	3,706
Earnings from operations	38	75	371	138
Interest expense
Other income (expense)	21	(237)	53	(144)
Earnings before income taxes	59	(162)	424	(6)
Tax provision (benefit)	(242)	(234)	(271)	(363)
Net earnings	$ 301	$ 72	$ 695	$ 357