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Note 9 - Preferred Stock (Details Narrative) - shares |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Aug. 10, 2021 | Aug. 31, 2019 | Jul. 31, 2021 | Apr. 30, 2021
Series A Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
[custom:SeriesAPreferredStockSharesExemptFromReverseStockSplit] |  | 208,704 |  |
Preferred Stock, Shares Outstanding | 158,704 |  | 158,704 | 158,704
[custom:PreferredStockSharesConvertedCommonStockSharesIssued] | 1,321,996 |  |  |
Series B Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 986,676 | 1,968,676
[custom:PreferredStockSharesConvertibleIntoCommonStockShares] |  |  | 822,230 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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