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Note 13 - Discontinued Operations (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operation, Amounts of Material Contingent Liabilities Remaining	$ 17,377		$ 17,511
Cash Provided by (Used in) Operating Activities, Discontinued Operations	$ (292)	$ (511)

Amounts of material contingent liabilities, for example, but not limited to, product or environmental liabilities or litigation, that remain with the entity despite the disposal of the disposal group that is classified as a component of the entity.

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