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Note 4 - Discontinued Operations - Operating Results for Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales			$ 12
Cost of sales			1,792
Gross loss			(1,780)
Selling, general, and administrative expense			(1)
Gain on sale of facility			(6)
Operating loss			(1,773)
Interest expense
Loss before income taxes			(1,773)
Income tax benefit			(2)
Net loss			$ (1,771)

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