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Note 21 - Material Overcharge Settlement (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Polyurethane Foam Antitrust Lawsuit [Member]      
Litigation Settlement, Amount Awarded from Other Party $ 0.1 $ 0.1 $ 2.1