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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Condensed Consolidated Statements Of Operations        
Net sales $ 35,241 $ 34,385 $ 70,018 $ 67,184
Cost of goods sold 25,406 25,530 51,502 49,231
Gross profit 9,835 8,855 18,516 17,953
Selling, general and administrative expense 5,902 5,544 12,061 11,338
Other operating income (expense):        
Litigation settlement gain     7,468  
Litigation expense   (373) (227) (1,941)
Facility consolidation costs (795)   (1,798)  
Operating income 3,138 2,938 11,898 4,674
Other non-operating income, net 128 80 257 102
Interest expense (187) (223) (399) (420)
Income before income taxes 3,079 2,795 11,756 4,356
Provision for income taxes 1,448 1,075 6,135 3,599
Net income $ 1,631 $ 1,720 $ 5,621 $ 757
Basic and diluted income per common share $ 0.13 $ 0.14 $ 0.45 $ 0.06
Cash dividends per share $ 0.125 $ 0.125 $ 0.25 $ 0.25
Shares used in the calculation of basic and diluted income per share 12,381 12,373 12,378 12,371