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Note 1 - Basis of Presentation and Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Debt Securities, Held-to-Maturity [Table Text Block] |
|  | March 31, 2025 |  |  | December 31, 2024 |
Held to maturity U.S. Treasury securities |  |  |  |  |  |  |  |
Amortized cost |  | $ | 950 |  |  | $ | 950 |
Gross unrealized gain |  |  | 40 |  |  |  | 26 |
Fair value |  | $ | 990 |  |  | $ | 977 |

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