Note 6 - Subsequent Events (Details Textual)	Apr. 17, 2019 shares
Subsequent Event [Member]
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture	95,675

Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

No definition available.

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