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Note 4 - Investments (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Marketable Securities [Table Text Block] |
|  | June 30, 2024
|  |  |  |  |  |  |  |  |  | Cumulative
|  |  |  |  |  |  |  |  |  | Unrealized
|  | Fair Value |  | Basis |  | (Loss) Gain
Equity securities |  | $ | 18 |  |  | $ | 34 |  |  | $ | (16 | )
Total |  | $ | 18 |  |  | $ | 34 |  |  | $ | (16 | )
|  | December 31, 2023
|  |  |  |  |  |  |  |  |  | Cumulative
|  |  |  |  |  |  |  |  |  | Unrealized
|  | Fair Value |  | Basis |  | (Loss) Gain
Equity securities |  | $ | 22 |  |  | $ | 34 |  |  | $ | (12 | )
Total |  | $ | 22 |  |  | $ | 34 |  |  | $ | (12 | )
Investment Income [Table Text Block] |
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Interest on cash and cash equivalents |  | $ | 538 |  |  | $ | 275 |  |  | $ | 1,037 |  |  | $ | 473 |
Net investment income |  | $ | 538 |  |  | $ | 275 |  |  | $ | 1,037 |  |  | $ | 473 |
Gain (Loss) on Securities [Table Text Block] |
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Marketable securities |  | $ | (1 | ) |  | $ | 43 |  |  | $ | (4 | ) |  | $ | 388 |
Net (losses) gains |  | $ | (1 | ) |  | $ | 43 |  |  | $ | (4 | ) |  | $ | 388 |

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