Note 9 - Stockholders' Deficit - Option Activity (Details) - $ / shares |
6 Months Ended | |
|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Outstanding (in shares) | 45,468 | |
| Outstanding, weighted average exercise price (in dollars per share) | $ 14.28 | |
| Granted (in shares) | 1,216,149 | 0 |
| Granted, weighted average exercise price (in dollars per share) | $ 0.24 | |
| Vested (in shares) | 0 | |
| Vested, weighted average exercise price (in dollars per share) | $ 0 | |
| Forfeited, canceled (in shares) | (26,730) | |
| Forfeited, canceled, weighted average exercise price (in dollars per share) | $ 14.89 | |
| Outstanding (in shares) | 1,234,887 | |
| Outstanding, weighted average exercise price (in dollars per share) | $ 0.44 | |
| X | ||||||||||
- Definition Number of share options (or share units) vested during the period. No definition available.
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| X | ||||||||||
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by vesting of options. No definition available.
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| X | ||||||||||
- Definition For presentations that combine terminations, 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 or that expired. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Weighted average price of options that were either forfeited or expired. 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/2003/role/disclosureRef
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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 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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