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Note 13 - Capital Stock (Details Textual) - USD ($) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2021 | Apr. 08, 2021 | Mar. 19, 2021 | Sep. 23, 2020 | Jul. 31, 2021 | Jul. 31, 2020 | Apr. 30, 2021 | Jul. 31, 2019
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 1.90 | $ 2.03 |  | $ 1.94
Share Price (in dollars per share) |  |  |  | $ 0.96 |  |  |  |
Class of Warrant or Right, Fair Value Per Share (in dollars per share) |  |  |  | $ 0.23 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 3,588,291 | $ 0 |  |
Warrant Issued with September 2020 Offering [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 1.80 |  |  |  |
Warrants and Rights Outstanding, Term (Month) |  |  |  | 2 years |  |  |  |
Warrant Issued to Agents [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 4.125 |  | $ 1.80 |  |  |  |
Warrants and Rights Outstanding, Term (Month) |  | 5 years |  | 2 years |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 181,818 |  | 583,333 |  |  |  |
Class of Warrant or Right, Fair Value Per Share (in dollars per share) |  |  |  |  |  |  | $ 1.80 |
September 2020 Offering [Member] |  |  |  |  |  |  |  |
Number of Units Issued During Period (in shares) |  |  |  | 12,500,000 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  | $ 1.20 |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  |  | $ 15,000,000 |  |  |  |
Number of Shares per Unit Issued (in shares) |  |  |  | 1 |  |  |  |
Number of Warrants per Unit (in shares) |  |  |  | 0.5 |  |  |  |
The 2020 At-the-market Offering [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 13,668,906 |  |  |
Proceeds from Issuance of Common Stock, Net |  |  |  |  | $ 29,320,949 |  |  |
The 2020 At-the-market Offering [Member] | Weighted Average [Member] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  | $ 2.19 |  |  |
Direct Offering [Member] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 3.30 | $ 3.05 |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 3,636,364 | 10,000,000 |  |  |  |  |
Proceeds from Issuance of Common Stock, Net |  | $ 11,315,966 | $ 29,083,710 |  |  |  |  |
The 2021 At-the-market Offering [Member] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  | $ 2.78 |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 2,265,700 |  |  |
Proceeds from Issuance of Common Stock, Net |  |  |  |  | $ 6,156,690 |  |  |
The 2021 At-the-market Offering [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 3.09 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 20,743,878 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net | $ 62,671,103 |  |  |  |  |  |  |

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