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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net sales $ 147,843 $ 146,132 $ 138,850
Cost of sales 112,356 111,482 101,396
Gross profit 35,487 34,650 37,454
Selling, general, and administrative expenses 23,845 24,105 24,008
Restructuring costs 63 420 1,756
Material overcharge settlement (121) (2,114)
Loss (Gain) on sales of property, plant and equipment 7 2 (24)
Operating income 11,693 12,237 11,714
Other (income) expenses:      
Interest income (216) (149) (114)
Interest expense 50 69 87
Total other (income) expense (166) (80) (27)
Income before income tax provision 11,859 12,317 11,741
Income tax expense 2,649 4,347 4,148
Net income from consolidated operations $ 9,210 $ 7,970 $ 7,593
Net income per common share outstanding:      
Basic (in dollars per share) $ 1.27 $ 1.11 $ 1.07
Diluted (in dollars per share) $ 1.26 $ 1.10 $ 1.05
Weighted average common shares outstanding:      
Basic (in shares) 7,248 7,190 7,102
Diluted (in shares) 7,337 7,275 7,206