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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Condensed Consolidated Statements of Income    
Net sales $ 34,609 $ 33,697
Cost of sales 25,580 24,795
Gross profit 9,029 8,902
Selling, general & administrative expenses 5,834 5,946
Operating income 3,195 2,956
Interest expense, net 22 40
Income before income tax expense 3,173 2,916
Income tax expense 1,111 886
Net income $ 2,062 $ 2,030
Net income per share:    
Basic (in dollars per share) $ 0.30 $ 0.30
Diluted (in dollars per share) $ 0.29 $ 0.29
Weighted average common shares outstanding:    
Basic (in shares) 6,972 6,768
Diluted (in shares) 7,148 7,088