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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Statement        
Net sales $ 38,494 $ 22,254 $ 114,797 $ 78,500
Cost of goods sold 31,120 17,620 93,132 64,499
Gross profit 7,374 4,634 21,665 14,001
Selling, general and administrative expenses 4,601 3,140 14,079 10,684
Operating income 2,773 1,494 7,586 3,317
Interest income 196 233 688 741
Income before income taxes 2,969 1,727 8,274 4,058
Income tax provision 859 527 2,359 963
Net income $ 2,110 $ 1,200 $ 5,915 $ 3,095
Earnings per share        
Basic (in dollars per share) $ 0.06 $ 0.03 $ 0.16 $ 0.09
Diluted (in dollars per share) $ 0.06 $ 0.03 $ 0.16 $ 0.08
Dividends paid per share (in dollars per share) $ 0.02   $ 0.06  
Average shares outstanding        
Basic (in share) 36,648 36,404 36,648 36,362
Diluted (in share) 36,758 36,574 36,793 36,781