Note 12 - Share-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2022 |
Dec. 31, 2021 |
|
| Balance (in shares) | 1,896,600 | |
| Balance, weighted average exercise price (in dollars per share) | $ 5.22 | |
| Balance, aggregate intrinsic value | $ 0 | $ 169 |
| Granted (in shares) | 837,398 | |
| Granted, weighted average exercise price (in dollars per share) | $ 2.81 | |
| Exercised (in shares) | 0 | |
| Exercised, weighted average exercise price (in dollars per share) | $ 0 | |
| Expired/cancelled (in shares) | (57,813) | |
| Expired / cancelled, weighted average exercise price (in dollars per share) | $ 8.46 | |
| Forfeited (in shares) | (52,187) | |
| Forfeited, weighted average exercise price (in dollars per share) | $ 3.90 | |
| Balance (in shares) | 2,623,998 | |
| Balance, weighted average exercise price (in dollars per share) | $ 4.37 |
| X | ||||||||||
- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. 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/2003/role/disclosureRef
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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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 of the plan that expired. 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 Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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