Note 2 - Condensed Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Chem Free [Member] | Discontinued Operations, Disposed of by Sale [Member]
Net sales	$ 2,902	$ 10,398
Operating income	197	2,021
Net income before income taxes	6	1,146
Income taxes	9	35
Net income (loss) from discontinued operations	(3)	1,111
Net income (loss) from discontinued operations	$ (3)	$ 1,211