Note 4 - Income Taxes - Summary of Unrecognized Tax Benefits (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Unrecognized tax benefits — January 1 | $ 181,000 | $ 0 |
| Additions based on tax positions related to the current year | 0 | 630,000 |
| Additions for tax positions of prior years | 0 | 0 |
| Reductions for tax positions of prior years | 0 | 0 |
| Reductions for tax positions of current years | (181,000) | (449,000) |
| Unrecognized tax benefits — December 31 | $ 0 | $ 181,000 |
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|