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Note 13 - Capital Stock - Warrants Outstanding and Exercisable (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019
Weighted Average Exercise Price (in dollars per share) | $ 1.90 | $ 2.03 | $ 1.94
Number of Warrants Outstanding (in shares) | 5,387,323 | 7,721,981 | 19,443,910
Weighted Average Remaining Contractual Life (Year) | 1 year 94 days |  |
Warrants 1 [Member] |  |  |
Weighted Average Exercise Price (in dollars per share) | $ 2.30 |  |
Number of Warrants Outstanding (in shares) | 271,546 |  |
Weighted Average Remaining Contractual Life (Year) | 1 year 7 days |  |
Expiry Date | Aug. 09, 2022 |  |
Warrants 2 [Member] |  |  |
Weighted Average Exercise Price (in dollars per share) | $ 1.64 |  |
Number of Warrants Outstanding (in shares) | 25,000 |  |
Weighted Average Remaining Contractual Life (Year) | 1 year 292 days |  |
Expiry Date | May 21, 2023 |  |
Warrants 3 [Member] |  |  |
Weighted Average Exercise Price (in dollars per share) | $ 1.80 |  |
Number of Warrants Outstanding (in shares) | 4,908,959 |  |
Weighted Average Remaining Contractual Life (Year) | 1 year 54 days |  |
Expiry Date | Sep. 23, 2022 |  |
Warrants 4 [Member] |  |  |
Weighted Average Exercise Price (in dollars per share) | $ 1.83 |  |
Number of Warrants Outstanding (in shares) | 181,818 |  |
Weighted Average Remaining Contractual Life (Year) | 4 years 248 days |  |
Expiry Date | Apr. 05, 2026 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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