Note 2 - Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 394
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 394	$ (636)

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