Note 6 - Redeemable Preferred Stock and Stockholder's Equity (Details) - shares	Jul. 31, 2018	Apr. 30, 2018	Jan. 19, 2016
Details
Preferred Stock, Shares Outstanding	606,417,622	194,415,754
Common Stock, Shares Authorized	20,000,000,000	20,000,000,000	250,000,000

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_PreferredStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant