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Note 8 - Capital Shares - Schedule of Options (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 383,040 | 420,615 | 314,853
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 328,388 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 24.93 | $ 25.6 | $ 32.62
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 24.93 | $ 25.6 | $ 32.62
Range One [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 374 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 374 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 246.96 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 246.96 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Range Two [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 37,719 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 37,719 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 15.12 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 15.12 |  |
Range Two [Member] | Minimum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Aug. 31, 2027 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Aug. 31, 2027 |  |
Range Two [Member] | Maximum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Dec. 31, 2028 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Dec. 31, 2028 |  |
Range Three [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 43,031 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 43,031 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 22.12 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Feb. 28, 2030 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 22.12 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Feb. 28, 2030 |  |
Range Four [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 51,006 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 51,006 |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) | $ 52.08 |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ 56.49 |  |
Range Four [Member] | Minimum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Sep. 30, 2030 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Sep. 30, 2030 |  |
Range Four [Member] | Maximum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Oct. 31, 2030 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Oct. 31, 2030 |  |
Range Five [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 81,041 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 81,013 |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) | $ 36.75 |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ 40.18 |  |
Range Five [Member] | Minimum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Range Five [Member] | Maximum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Sep. 30, 2031 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Sep. 30, 2031 |  |
Range Six [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 58,753 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 52,957 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 25.97 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 25.97 |  |
Range Six [Member] | Minimum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Range Six [Member] | Maximum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Feb. 28, 2032 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Feb. 28, 2032 |  |
Range Seven [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 111,116 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares) | 62,288 |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) | $ 4.1 |  |
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ 10.01 |  |
Range Seven [Member] | Minimum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Mar. 31, 2025 |  |
Range Seven [Member] | Maximum [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Oct. 31, 2033 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date | Oct. 31, 2033 |  |

X
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