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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Consolidated Statements of Income        
Net sales $ 37,902 $ 36,499 $ 72,406 $ 70,476
Cost of sales 27,607 26,206 54,384 51,544
Gross profit 10,295 10,293 18,022 18,932
Selling, general, and administrative expenses 6,470 6,776 12,374 12,800
Restructuring costs 55 30 178 108
Material overcharge settlement (423)   (423)  
Gain on sale fixed assets     (4) (31)
Operating income 4,193 3,487 5,897 6,055
Other expenses:        
Interest (income) expense, net (15) (8) (26) 15
Income before income tax provision 4,208 3,495 5,923 6,040
Income tax expense 1,473 1,223 2,113 2,114
Net income $ 2,735 $ 2,272 $ 3,810 $ 3,926
Net income per share:        
Basic (in dollars per share) $ 0.38 $ 0.32 $ 0.53 $ 0.55
Diluted (in dollars per share) $ 0.38 $ 0.32 $ 0.53 $ 0.55
Weighted average common shares outstanding:        
Basic (in shares) 7,196 7,116 7,185 7,096
Diluted (in shares) 7,271 7,210 7,263 7,203