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Note 13 - Capital Stock (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 13, 2022 | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2022 | Apr. 30, 2021 | Nov. 26, 2021 | Jul. 31, 2021 | May 14, 2021
Proceeds from Warrant Exercises |  | $ 645,696 |  | $ 2,697,927 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value |  | 23,997,678 |  | 23,997,678 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  | 16,570,688 |  | 16,570,688 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested in Period, Intrinsic Value |  | 7,426,990 |  | 7,426,990 |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 540,730 |  | $ 540,730 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 9 months 29 days |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | 572,065 |  | $ 572,065 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 1 year 5 months 4 days |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 182,664 | $ 262,970 | $ 560,306 | $ 806,638 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  | 997,612 |  | 997,612 |  |  | 997,612 |
Performance-based Restriced Stock Units [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 475,190 |  | $ 475,190 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  | 1 year 5 months 8 days |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 73,269 | $ 37,544 | $ 219,958 | $ 112,632 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  | 1,250,451 |  | 1,250,451 |  |  | 1,250,451 |
May 2021 At-the-market Offering [Member] |  |  |  |  |  |  |  |
Stock Offering, Maximum Amount |  |  |  |  |  |  |  | $ 100,000,000
November 2021 At-the-market Offering [Member] |  |  |  |  |  |  |  |
Stock Offering, Maximum Amount |  |  |  |  |  | $ 100,000,000 |  |
The 2021 At-the-market Offerings [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 4,800,000 |  | 43,295,536 |  |  |  |
Proceeds from Issuance of Common Stock, Net |  | $ 18,557,112 |  | $ 149,200,901 |  |  |  |
The 2021 At-the-market Offerings [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 2,102,000 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net | $ 7,309,084 |  |  |  |  |  |  |

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