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Note 3 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized cost, as adjusted | $ 129,678 | $ 120,363
Gross unrealized holding gains | 7 | 331
Gross unrealized holding losses | (371) | 0
Estimated fair value | 129,314 | 120,694
US Government Agencies Debt Securities [Member] | Short-Term Investments [Member] |  |
Amortized cost, as adjusted | 69,673 | 62,822
Gross unrealized holding gains | 5 | 130
Gross unrealized holding losses | (53) | 0
Estimated fair value | 69,625 | 62,952
US Government Agencies Debt Securities [Member] | Long Term Investments [Member] |  |
Amortized cost, as adjusted | 60,005 | 57,541
Gross unrealized holding gains | 2 | 201
Gross unrealized holding losses | (318) | 0
Estimated fair value | $ 59,689 | $ 57,742

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