Note 11 - Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Deferred Compensation Plan Assets	$ 8,971	$ 6,084
Deferred Compensation Liability, Current and Noncurrent	$ 9,000	$ 6,200

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DeferredCompensationPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant