Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statements Of Operations [Abstract]
Revenues	$ 107,579	$ 100,864	$ 98,453
Cost of revenues	84,051	78,096	78,355
Gross profit	23,528	22,768	20,098
Distribution expenses	8,619	7,525	6,933
Selling and administrative expenses	16,159	16,362	16,607
Loss from operations	(1,250)	(1,119)	(3,442)
Interest expense	655	702	619
Other income	(362)	(361)	(367)
Loss before income taxes	(1,543)	(1,460)	(3,694)
Income tax expense	34	100	82
Net loss	$ (1,577)	$ (1,560)	$ (3,776)
Basic loss per common share	$ (0.24)	$ (0.24)	$ (0.58)
Diluted loss per common share	$ (0.24)	$ (0.24)	$ (0.58)
Weighted average common shares outstanding - basic	6,467	6,450	6,464
Weighted average common shares outstanding - diluted	6,467	6,450	6,464