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Note 13 - Capital Stock - Continuity Schedule of Outstanding Share Purchase Warrants (Details) - $ / shares | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Balance, Number of Warrants (in shares) | 7,721,981 | 19,443,910
Balance, Weighted Average Exercise Price (in dollars per share) | $ 2.03 | $ 1.94
Issued, Number of Warrants (in shares) |  | 300,000
Issued, Weighted Average Exercise Price (in dollars per share) |  | $ 1.38
Expired, Number of Warrants (in shares) | (1,109,304) | (12,021,929)
Expired (in dollars per share) | $ 1.87 | $ 1.87
Exercised, Number of Warrants (in shares) | (8,240,505) |
Exercised, Weighted Average Exercise Price (in dollars per share) | $ 1.99 |
Balance, Number of Warrants (in shares) | 5,387,323 | 7,721,981
Balance, Weighted Average Exercise Price (in dollars per share) | $ 1.90 | $ 2.03
September 2020 Offering [Member] |  |
Issued, Number of Warrants (in shares) | 6,833,333 |
Issued, Weighted Average Exercise Price (in dollars per share) | $ 1.80 |
April 2021 Offering [Member] |  |
Issued, Number of Warrants (in shares) | 181,818 |
Issued, Weighted Average Exercise Price (in dollars per share) | $ 4.13 |

X
- Definition Number of warrants or rights exercised during the period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
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X
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- Definition Number of warrants or rights issued during the period. + References No definition available. + Details
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X
- 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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X
- Details
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X
- Details
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Period Type: |