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Note 7 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Deferred Compensation Liability, Current and Noncurrent	$ 17.7	$ 18.3

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant