Note 1 - General (Details Textual) $ in Thousands	Jan. 01, 2019 USD ($)
Accounting Standards Update 2018-11 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0
Accounting Standards Update 2017-08 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

No definition available.

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