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Note 13 - Material Overcharge Settlement (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Polyurethane Foam Antitrust Lawsuit [Member]
Litigation Settlement, Amount Awarded from Other Party	$ 0	$ 1,700,000	$ 121,000	$ 2,100,000

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- Definition

Amount awarded from other party in judgment or settlement of litigation.

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