Note 1 - General (Details Textual) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Accounting Standards Update 2014-09 [Member] \| Period Ended March 31, 2017 [Member]
Prior Period Reclassification Adjustment	$ 654

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