Note 8 - Stock-based Compensation - Schedule of Stock Option Activity (Details) - $ / shares |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Outstanding, beginning of period, shares (in shares) | 226,602 | 260,602 |
| Outstanding, beginning of period, weighted average price (in dollars per share) | $ 18.77 | $ 18.37 |
| Exercised, shares (in shares) | (29,070) | (34,000) |
| Exercised, weighted average price (in dollars per share) | $ 14.28 | $ 15.74 |
| Outstanding, end of period, shares (in shares) | 197,532 | 226,602 |
| Outstanding, end of period, weighted average price (in dollars per share) | $ 19.43 | $ 18.77 |
| Exercisable, end of period, shares (in shares) | 161,249 | 168,786 |
| Exercisable, end of period, weighted average price (in dollars per share) | $ 20.25 | $ 19.64 |
| X | ||||||||||
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. 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 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 Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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