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Note 10 - Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
|  | Three Months Ended March 31, 2024 |  | Year Ended December 31, 2023
|  | Common Stock Issued |  | Held in Treasury |  | Common Stock Outstanding |  | Common Stock Issued |  | Held in Treasury |  | Common Stock Outstanding
Shares, beginning of year |  |  | 5,454,639 |  |  |  | (81,584 | ) |  |  | 5,373,055 |  |  |  | 5,434,521 |  |  |  | (81,584 | ) |  |  | 5,352,937 |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  | — |  |  |  | 20,118 |  |  |  | — |  |  |  | 20,118 |
Shares, end of period |  |  | 5,454,639 |  |  |  | (81,584 | ) |  |  | 5,373,055 |  |  |  | 5,454,639 |  |  |  | (81,584 | ) |  |  | 5,373,055 |

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