Note 2 - Summary of Significant Accounting Policies - Debt Securities, Available-for-Sale (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Gross realized gains reclassified from OCI | $ 0 | $ 0 | $ 0 | $ 0 |
| Gross realized losses reclassified from OCI | (8,000) | 0 | (8,000) | 0 |
| Net gains (losses) reclassified from OCI | $ (8,000) | $ 0 | $ (8,000) | $ 0 |
| X | ||||||||||
- Definition Amount of realized gain on available for sale securities recognized in other comprehensive income before reclassification for tax. No definition available.
|
| X | ||||||||||
- Definition Amount of realized loss on available for sale securities recognized in other comprehensive income before reclassification for tax. No definition available.
|
| X | ||||||||||
- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|