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

X

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: