Note 8 - Share-based Compensation - Unvested Balance of Options (Details) - $ / shares |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Unvested, number of unvested options (in shares) | 138,500 | |
| Unvested, weighted average exercise price per share (in dollars per share) | $ 4.33 | |
| Unvested, weighted average remaining contractual term (Year) | 8 years 2 months 12 days | 8 years 6 months |
| Granted, number of unvested options (in shares) | 0 | |
| Granted, weighted average exercise price per share (in dollars per share) | $ 0 | |
| Forfeited, number of unvested options (in shares) | 0 | |
| Forfeited, weighted average exercise price per share (in dollars per share) | $ 0 | |
| Vested, number of unvested options (in shares) | (10,166) | |
| Vested, weighted average exercise price per share (in dollars per share) | $ 0 | |
| Unvested, number of unvested options (in shares) | 128,334 | 138,500 |
| Unvested, weighted average exercise price per share (in dollars per share) | $ 2.81 | $ 4.33 |
| X | ||||||||||
- Definition Weighted average remaining contractual term for option awards nonvested outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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- 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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- 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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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of non-vested options outstanding. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Number of non-vested options forfeited. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Weighted average grant-date fair value of non-vested options outstanding. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Number of options vested. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Weighted average grant-date fair value of options vested. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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