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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Condensed Consolidated Statements of Income        
Net sales $ 36,499 $ 34,025 $ 70,476 $ 68,634
Cost of sales 26,206 24,480 51,544 49,912
Gross profit 10,293 9,545 18,932 18,722
Selling, general and administrative expenses 6,776 6,535 12,800 12,428
Restructuring costs 30 234 108 324
Gain on sale of fixed assets   (12) (31) (12)
Operating income 3,487 2,788 6,055 5,982
Other expenses        
Interest income (expense), net 8 (27) (15) (48)
Other income   100   100
Income before income tax expense 3,495 2,861 6,040 6,034
Income tax expense 1,223 1,001 2,114 2,112
Net income $ 2,272 $ 1,860 $ 3,926 $ 3,922
Net income per share:        
Basic (in dollars per share) $ 0.32 $ 0.27 $ 0.55 $ 0.56
Diluted (in dollars per share) $ 0.32 $ 0.26 $ 0.55 $ 0.55
Weighted average common shares outstanding        
Basic (in shares) 7,116 7,025 7,096 6,999
Diluted (in shares) 7,210 7,168 7,203 7,160