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Note 6 - Capital Shares - Options Outstanding and Exercisable (Details) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 $ / shares shares | Mar. 31, 2025 $ / shares shares | Sep. 30, 2024 $ / shares shares | Mar. 31, 2024 $ / shares shares | Sep. 30, 2023 $ / shares shares
Options outstanding (in shares) | 382,666 | 382,666 | 383,040 | 419,676 | 420,615
Options exercisable (in shares) | 340,126 | 340,126 |  |  |
Options, exercise price (in CAD per Share) | $ / shares | $ 24.66 |  | $ 24.93 | $ 25.47 | $ 25.6
Range One [Member] |  |  |  |  |
Options outstanding (in shares) | 37,719 | 37,719 |  |  |
Options exercisable (in shares) | 37,719 | 37,719 |  |  |
Options, exercise price (in CAD per Share) | $ / shares |  | $ 15.12 |  |  |
Range Two [Member] |  |  |  |  |
Options outstanding (in shares) | 43,031 | 43,031 |  |  |
Options exercisable (in shares) | 43,031 | 43,031 |  |  |
Options, exercise price (in CAD per Share) | $ / shares | $ 22.12 |  |  |  |
Range Three [Member] |  |  |  |  |
Options outstanding (in shares) | 51,006 | 51,006 |  |  |
Options exercisable (in shares) | 51,006 | 51,006 |  |  |
Options, exercise price, lower limit (in dollars per share) | $ / shares | $ 52.08 |  |  |  |
Options, exercise price, upper limit (in dollars per share) | $ / shares | $ 56.49 |  |  |  |
Range Four [Member] |  |  |  |  |
Options outstanding (in shares) | 81,041 | 81,041 |  |  |
Options exercisable (in shares) | 81,041 | 81,041 |  |  |
Options, exercise price, lower limit (in dollars per share) | $ / shares | $ 36.75 |  |  |  |
Options, exercise price, upper limit (in dollars per share) | $ / shares | $ 40.18 |  |  |  |
Range Five [Member] |  |  |  |  |
Options outstanding (in shares) | 58,753 | 58,753 |  |  |
Options exercisable (in shares) | 57,304 | 57,304 |  |  |
Options, exercise price (in CAD per Share) | $ / shares | $ 25.97 |  |  |  |
Range Six [Member] |  |  |  |  |
Options outstanding (in shares) | 111,116 | 111,116 |  |  |
Options exercisable (in shares) | 70,025 | 70,025 |  |  |
Options, exercise price, lower limit (in dollars per share) | $ / shares | $ 4.1 |  |  |  |
Options, exercise price, upper limit (in dollars per share) | $ / shares | $ 10.01 |  |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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