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Note 12 - Common Stock (Details Narrative) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2021 | Jul. 31, 2021 | Oct. 31, 2021 | Apr. 30, 2021
Class of Stock [Line Items] |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  | $ 0.001
Common Stock, Shares Authorized | 500,000,000 |  | 500,000,000 | 500,000,000
Stock Issued During Period, Shares, Other |  |  | 50,000 |
Stock Issued During Period, Shares, Acquisitions | 21,972 | 685,321 |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 62,500 |
Stock Issued During Period, Shares, Issued for Services | 20,000 |  |  |
[custom:StockIssuedDuringPeriodSharesAcquisitions1] | 3,588,272 |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture | 243,615 |  |  |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 21,972 | 685,321 |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 1,321,966 | 818,333 |  |
Stock Issued During Period, Shares, Issued for Services | 20,000 | 91,667 |  |
[custom:StockIssuedDuringPeriodSharesAcquisitions1] | 3,588,272 |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture | 243,615 | 62,500 |  |
Series A Preferred Stock 1 [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | (158,704) |  |  |
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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