Note 8 - Stock-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Balance, number of options outstanding (in shares) | 176,000 | 270,500 |
| Balance, option, weighted average exercise price (in dollars per share) | $ 1.94 | $ 3.09 |
| Expired or forfeited, options (in shares) | (105,000) | |
| Expired or forfeited, option, weighted average exercise price (in dollars per share) | $ 2.44 | |
| Balance, number of options outstanding (in shares) | 71,000 | 176,000 |
| Balance, option, weighted average exercise price (in dollars per share) | $ 1.2 | $ 1.94 |
| Exercisable, options (in shares) | 71,000 | 176,000 |
| Exercisable, option, weighted average exercise price (in dollars per share) | $ 1.2 | $ 1,940 |
| Weighted-Average Remaining Contractual Life (years) (Year) | 1 year 4 months 2 days | 1 year 2 months 4 days |
| Aggregate Intrinsic Value | $ 26 | $ 4 |
| 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 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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- 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 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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