Note 6 - Stock-based Compensation - Restricted Stock Weighted Average Grant Date Fair Value (Details) - $ / shares |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2023 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2022 |
Sep. 30, 2021 |
|
| Non Vested at September 30, 2021 and 2020 (in dollars per share) | $ 0 | $ 160.00 | $ 144.00 | $ 160.00 | $ 0 |
| Vested (in dollars per share) | 0 | (160.00) | (256.00) | ||
| Non Vested at September 30, 2022 and 2021 (in dollars per share) | 0 | 160.00 | 0 | 160.00 | 160.00 |
| The 2013 Plan [Member] | |||||
| Non Vested at September 30, 2021 and 2020 (in dollars per share) | 144.00 | 160.00 | |||
| Vested (in dollars per share) | (144.00) | (160.00) | |||
| Non Vested at September 30, 2022 and 2021 (in dollars per share) | $ 0 | $ 160.00 | $ 0 | $ 160.00 | $ 160.00 |
| X | ||||||||||
- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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