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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales $ 190,455 $ 147,843 $ 146,132
Cost of sales 142,147 112,356 111,482
Gross profit 48,308 35,487 34,650
Selling, general, and administrative expenses 27,758 23,845 24,105
Acquisition costs 1,089
Restructuring costs 63 420
Material overcharge settlement (104) (121) (2,114)
(Gain) Loss on sales of property, plant and equipment (47) 7 2
Operating income 19,612 11,693 12,237
Interest income 47 216 149
Interest expense (1,320) (50) (69)
Other income 64
Income before income tax provision 18,403 11,859 12,317
Income tax expense 4,092 2,649 4,347
Net income $ 14,311 $ 9,210 $ 7,970
Net income per common share outstanding:      
Basic (in dollars per share) $ 1.95 $ 1.27 $ 1.11
Diluted (in dollars per share) $ 1.93 $ 1.26 $ 1.10
Weighted average common shares outstanding:      
Basic (in shares) 7,347 7,248 7,190
Diluted (in shares) 7,430 7,337 7,275