Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - Accounting Standards Update 2016-09 [Member] $ in Millions	Apr. 29, 2017 USD ($)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 4.6
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0.1

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