Note 8 - Stock Repurchase Program (Details) - USD ($) $ in Millions	Dec. 31, 2015	Jul. 31, 2013
Disclosure Text Block [Abstract]
Stock Repurchase Program, Authorized Amount		$ 100.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 5.9

Amount remaining of a stock repurchase plan authorized.

No definition available.

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