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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net sales $ 62,643 $ 33,365
Cost of sales 56,072 32,017
Gross profit 6,571 1,348
Selling, general, and administrative expense 4,247 3,385
Restructuring expense 305
Operating income (loss) 2,324 (2,342)
Other income 159 170
Interest income 4 77
Interest expense (131) (128)
Income (loss) before income taxes 2,356 (2,223)
Income tax expense (benefit) 191 (272)
Net income (loss) $ 2,165 $ (1,951)
us-gaap_EarningsPerShareAbstract    
Basic (in dollars per share) $ 0.22 $ (0.20)
Diluted (in dollars per share) $ 0.22 $ (0.20)
Shares used in per share calculations:    
Basic (in shares) 9,735 9,707
Diluted (in shares) 9,735 9,707