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Note 1 - Basis of Presentation and Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Debt Securities, Held-to-Maturity [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Fair Value |
Held to maturity U.S. Treasury securities |  | $ | 49,900 |  |  | $ | 535 |  |  | $ | 50,435 |

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