Note 8 - Stockholders' Equity - Restricted Stock Unit and Award Activity (Details) - RSU and RSA [Member] - $ / shares |
3 Months Ended | |
|---|---|---|
Jun. 30, 2023 |
Dec. 31, 2022 |
|
| Unvested balance (in shares) | 98,137 | 13,137 |
| Unvested balance, Weighted average grant date fair value (in dollars per share) | $ 2.60 | $ 12.08 |
| Unvested balance (in shares) | 13,137 | |
| Unvested balance, Weighted average grant date fair value (in dollars per share) | $ 12.08 | |
| Granted (in shares) | 85,000 | |
| Granted, Weighted average grant date fair value (in dollars per share) | $ 1.14 | |
| Unvested balance (in shares) | 98,137 | |
| Unvested balance, Weighted average grant date fair value (in dollars per share) | $ 2.60 |
| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| 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 | ||||||||||
- Details
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