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Note 4 - Investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Marketable Securities [Table Text Block] |
|  | December 31, 2024
|  |  |  |  |  |  |  |  |  | Cumulative
|  |  |  |  |  |  |  |  |  | Unrealized
|  | Fair Value |  | Basis |  | (Loss) Gain
Equity securities |  | $ | 17 |  |  | $ | 34 |  |  | $ | (17 | )
Total |  | $ | 17 |  |  | $ | 34 |  |  | $ | (17 | )
|  | December 31, 2023
|  |  |  |  |  |  |  |  |  | Cumulative
|  |  |  |  |  |  |  |  |  | Unrealized
|  | Fair Value |  | Basis |  | (Loss) Gain
Equity securities |  | $ | 22 |  |  | $ | 34 |  |  | $ | (12 | )
Total |  | $ | 22 |  |  | $ | 34 |  |  | $ | (12 | )
Investment Income [Table Text Block] |
|  | Year Ended December 31,
|  | 2024 |  | 2023
Interest on cash and cash equivalents |  | $ | 2,070 |  |  | $ | 1,566 |
Dividends on marketable securities |  |  | 1 |  |  |  | — |
Net investment income |  | $ | 2,071 |  |  | $ | 1,566 |
Gain (Loss) on Securities [Table Text Block] |
|  | Year Ended December 31,
|  | 2024 |  | 2023
Marketable securities (a) |  | $ | (5 | ) |  | $ | 384 |
Net (losses) gains |  | $ | (5 | ) |  | $ | 384 |

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