Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2016
Accounting Standards Update 2016-09 [Member]
Current Period Reclassification Adjustment	$ 2,200
Previously Unrecognized Tax Benefits Resulting from Operating Loss Carryovers [Member] \| March 31, 2016 [Member]
Prior Period Reclassification Adjustment		$ 600
Prior Period Reclassification Adjustment		$ 2,247

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration