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Note 2 - Sale of Subsidiary; Discontinued Operations - Condensed Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Chem Free [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Net sales				$ 2,902
Operating loss				(3)
Net income before income taxes				6
Income taxes				9
Net loss from discontinued operations				$ (3)