Note 9 - Stock-based Compensation (Details Textual) - shares			10 Months Ended
Jun. 11, 2018	Aug. 23, 2017	Jun. 11, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	10,000	60,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares			70,000

Gross number of share options (or share units) granted during the period.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration