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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net sales $ 42,061 $ 53,846 $ 75,989 $ 138,711
Cost of sales 44,223 56,439 83,588 137,413
Gross profit (loss) (2,162) (2,593) (7,599) 1,298
Selling, general and administrative expense 4,091 5,452 8,690 12,426
Impairment of goodwill 5,282 5,282
Operating loss (6,253) (13,327) (16,289) (16,410)
Other income (expense) (4) 14 35 58
Interest income 3 81 3 163
Interest expense (119) (286) (237) (703)
Loss before income taxes (6,373) (13,518) (16,488) (16,892)
Income tax benefit (131) (1,439) (663) (2,712)
Net loss $ (6,242) $ (12,079) $ (15,825) $ (14,180)
Net loss per share:        
Basic and diluted (in dollars per share) $ (0.65) $ (1.26) $ (1.65) $ (1.48)
Shares used in per share calculations:        
Basic and diluted (in shares) 9,580 9,557 9,576 9,555