Note 12 - Deferred Compensation Plans (Details Textual) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Other Liabilities [Member]
Deferred Compensation Liability, Current and Noncurrent	$ 3.6	$ 3.6
The Deferral Plan [Member]
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance	108,137	103,571
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 0.1	$ 0.1

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

No definition available.

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