Note 8 - Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares |
9 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Sep. 30, 2025 |
|
| Outstanding (in shares) | 5,517 | |
| Outstanding, weighted average exercise price (in dollars per share) | $ 991.7 | |
| Outstanding, weighted average remaining contractual term (Year) | 2 years 25 days | 3 years 1 month 20 days |
| Granted (in shares) | 0 | |
| Granted, weighted average exercise price (in dollars per share) | $ 0 | |
| Exercised (in shares) | 0 | |
| Exercised, weighted average exercise price (in dollars per share) | $ 0 | |
| Forfeited (in shares) | (1,408) | |
| Forfeited, weighted average exercise price (in dollars per share) | $ 1,331.29 | |
| Outstanding (in shares) | 4,109 | 5,517 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 732.53 | $ 991.7 |
| Exercisable (in shares) | 4,109 | |
| Exercisable, weighted average exercise price (in dollars per share) | $ 732.53 | |
| Exercisable (Year) | 2 years 25 days |
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted-average contractual term remaining for vested portion of option outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Weighted-average contractual term remaining for option award outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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