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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net sales $ 156,256 $ 236,608 $ 403,298
Cost of sales 159,481 249,233 362,722
Gross profit (loss) (3,225) (12,625) 40,576
Selling, general and administrative expense 17,178 22,303 24,316
Impairment of goodwill 5,282 16,066
Restructuring expense 990
Operating income (loss) (13,533) (40,210) 194
Other income 23 88 108
Interest income 14 173 466
Interest expense (523) (1,390) (2,290)
Loss before income taxes (14,019) (41,339) (1,522)
Income tax expense (benefit) (4,756) (11,951) 4,651
Loss from continuing operations (9,263) (29,388) (6,173)
Discontinued operations:      
Loss from operations of discontinued business (2,151)
Loss on sale of business (13,497)
Income tax benefit (3,934)
Loss on discontinued operations (11,714)
Net loss $ (9,263) $ (29,388) $ (17,887)
Basic and diluted loss per share:      
Continuing operations (in dollars per share) $ (0.97) $ (3.07) $ (0.65)
Discontinued operations (in dollars per share) (1.23)
Net loss per share (in dollars per share) $ (0.97) $ (3.07) $ (1.88)
Shares used in per share calculations:      
Basic and diluted (in shares) 9,588 9,560 9,515
Denver Facility [Member]      
(Gain) Loss on disposal of property and equpiment $ (7,860)