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Note 7 - Stock-based Compensation (Tables) | 3 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three months ended December 31, 2023 |
Dividend yield |  |  | 0.00 | %
Expected volatility |  |  | 61.71 | %
Risk-free interest rate |  |  | 4.55 | %
Expected life (years) |  | 3.5 |
Vesting period (years) |  | 3 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of options |  |  | Weighted average exercise price |
Outstanding as of September 30, 2023 |  |  | 254,124 |  |  | $ | 37.04 |
Granted |  |  | 111,299 |  |  |  | 26.18 |
Exercised |  |  | - |  |  |  | - |
Forfeited or expired |  |  | (1,731 | ) |  |  | 41.64 |
Outstanding as of December 31, 2023 |  |  | 363,692 |  |  | $ | 33.69 |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Number of shares |  |  | Weighted average grant date fair value |
Unvested shares as of September 30, 2023 |  |  | 90,575 |  |  | $ | 49.92 |
Granted |  |  | 121,884 |  |  |  | 26.18 |
Vested |  |  | (30,422 | ) |  |  | 52.67 |
Forfeited |  |  | (2,017 | ) |  |  | 35.26 |
Unvested as of December 31, 2023 |  |  | 180,020 |  |  | $ | 32.32 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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