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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net sales $ 69,203 $ 28,785 $ 131,846 $ 62,150
Cost of sales 60,985 30,023 117,057 62,040
Gross profit (loss) 8,218 (1,238) 14,789 110
Selling, general, and administrative expense 4,705 3,806 8,952 7,191
Restructuring expense 783 1,088
Operating income (loss) 3,513 (5,827) 5,837 (8,169)
Other income 25 20 184 190
Interest income 3 141 7 218
Interest expense (120) (128) (251) (256)
Income (loss) before income taxes 3,421 (5,794) 5,777 (8,017)
Income tax expense (benefit) 447 (108) 638 (380)
Net income (loss) $ 2,974 $ (5,686) $ 5,139 $ (7,637)
us-gaap_EarningsPerShareAbstract        
Basic (in dollars per share) $ 0.31 $ (0.59) $ 0.53 $ (0.79)
Diluted (in dollars per share) $ 0.31 $ (0.59) $ 0.53 $ (0.79)
Shares used in per share calculations:        
Basic (in shares) 9,736 9,727 9,736 9,717
Diluted (in shares) 9,753 9,727 9,745 9,717