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Note 3 - Discontinued Operations - Operating Results for Discontinued Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net sales $ 12 $ 6,869 $ 63,448
Cost of sales 1,792 9,777 76,679
Gross loss (1,780) (2,908) (13,231)
Selling, general and administrative expense (1) 257 1,925
Gain on sale of facility (6)
Operating loss (1,773) (3,165) (15,156)
Other income (expense) (1) 30
Interest income 172
Interest expense (14) (50)
Loss before income taxes (1,773) (3,180) (15,004)
Income tax benefit (2) (658) (3,428)
Net loss $ (1,771) $ (2,522) $ (11,576)