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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net sales $ 37,886 $ 37,902 $ 74,939 $ 72,406
Cost of sales 27,945 27,616 55,482 54,393
Gross profit 9,941 10,286 19,457 18,013
Selling, general & administrative expenses 6,061 6,470 12,376 12,374
Restructuring costs 63 55 63 178
Material overcharge settlement (121) (432) (121) (432)
Loss (Gain) on sale of fixed assets 8 3 (4)
Operating income 3,930 4,193 7,136 5,897
Interest income 42 32 84 62
Interest expense (13) (17) (27) (36)
Income before income tax expense 3,959 4,208 7,193 5,923
Income tax expense 1,329 1,473 2,392 2,113
Net income $ 2,630 $ 2,735 $ 4,801 $ 3,810
Net income per share:        
Basic (in dollars per share) $ 0.36 $ 0.38 $ 0.66 $ 0.53
Diluted (in dollars per share) $ 0.36 $ 0.38 $ 0.66 $ 0.53
Weighted average common shares outstanding:        
Basic (in shares) 7,239 7,175 7,228 7,159
Diluted (in shares) 7,323 7,250 7,312 7,238