Note 5 - Other Operating Expenses (Details Textual)	Mar. 14, 2016 USD ($)
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	$ 469,000

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration