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Note 13 - Material Overcharge Settlement (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Polyurethane Foam Antitrust Lawsuit [Member]          
Litigation Settlement, Amount Awarded from Other Party $ 121,000 $ 1,700,000 $ 432,000 $ 121,000 $ 432,000