Note 12 - Deferred Compensation Plans (Details Textual) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Other Liabilities [Member]
Deferred Compensation Liability, Current and Noncurrent	$ 3.6	$ 3.6
The Deferral Plan [Member]
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 0.1	$ 0.1
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance	112,282	103,571

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