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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net sales $ 37,053 $ 34,503
Cost of sales 27,537 26,776
Gross profit 9,516 7,727
Selling, general & administrative expenses 6,316 5,904
Restructuring costs 123
Gain on sale of fixed assets (5) (4)
Operating income 3,205 1,704
Interest income (42) (30)
Interest expense 14 19
Income before income tax expense 3,233 1,715
Income tax expense 1,062 640
Net income $ 2,171 $ 1,075
Net income per share:    
Basic (in dollars per share) $ 0.30 $ 0.15
Diluted (in dollars per share) $ 0.30 $ 0.15
Weighted average common shares outstanding:    
Basic (in shares) 7,216 7,173
Diluted (in shares) 7,297 7,253