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Note 4 - Discontinued Operations - Operating Results for Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales						$ 12	$ 6,869
Cost of sales						1,792	9,777
Gross loss						(1,780)	(2,908)
Selling, general, and administrative expense						(1)	257
Gain on sale of facility						(6)
Operating loss						(1,773)	(3,165)
Other expense							(1)
Interest expense							(14)
Loss before income taxes						(1,773)	(3,180)
Income tax benefit						(2)	(658)
Net loss	$ (316)	$ (482)	$ (647)	$ (326)		$ (1,771)	$ (2,522)

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Amount of general and administrative expense (benefit) attributable to disposal group, including, but not limited to, discontinued operation.

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