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Note 8 - Common Stock (Details Narrative) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2021 | Apr. 30, 2021
Class of Stock [Line Items] |  |
Common Stock, Par or Stated Value Per Share | $ 0.001 | $ 0.001
Common Stock, Shares Authorized | 500,000,000 | 500,000,000
Stock Issued During Period, Shares, Other | 50,000 |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 62,500 |
Common Stock Offering 1 [Member] |  |
Class of Stock [Line Items] |  |
Sale of Stock, Number of Shares Issued in Transaction | 4,000,000 |
[custom:SaleOfStockGrossConsiderationReceivedOnTransaction] | $ 16,000,000 |
Sale of Stock, Consideration Received on Transaction | $ 14,600,000 |
Common Stock Offering 2 [Member] |  |
Class of Stock [Line Items] |  |
Sale of Stock, Number of Shares Issued in Transaction | 13,333,334 |
[custom:SaleOfStockGrossConsiderationReceivedOnTransaction] | $ 60,000,000 |
Sale of Stock, Consideration Received on Transaction | $ 55,000,000 |

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