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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net sales $ 35,684 $ 37,220 $ 110,623 $ 109,626
Cost of sales 27,491 28,768 82,973 83,161
Gross profit 8,193 8,452 27,650 26,465
Selling, general & administrative expenses 5,693 6,027 18,070 18,402
Restructuring costs 25 63 203
Material overcharge settlement (1,681) (121) (2,114)
Loss (Gain) on sale of fixed assets 3 (4)
Operating income 2,500 4,081 9,635 9,978
Interest income 63 42 147 104
Interest expense (12) (17) (39) (53)
Income before income tax expense 2,551 4,106 9,743 10,029
Income tax expense 856 1,437 3,248 3,550
Net income $ 1,695 $ 2,669 $ 6,495 $ 6,479
Net income per share:        
Basic (in dollars per share) $ 0.23 $ 0.37 $ 0.90 $ 0.90
Diluted (in dollars per share) $ 0.23 $ 0.37 $ 0.89 $ 0.89
Weighted average common shares outstanding:        
Basic (in shares) 7,264 7,195 7,240 7,183
Diluted (in shares) 7,353 7,282 7,326 7,265