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Note 5 - Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Marketable Securities [Table Text Block] |
|  | December 31, 2023
|  |  |  |  |  |  |  |  |  | Cumulative
|  |  |  |  |  |  |  |  |  | Unrealized
|  | Fair Value |  | Basis |  | (Loss) Gain
Equity securities (a) |  | $ | 22 |  |  | $ | 34 |  |  | $ | (12 | )
Mutual funds (b) |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 22 |  |  | $ | 34 |  |  | $ | (12 | )
|  | December 31, 2022
|  |  |  |  |  |  |  |  |  | Cumulative
|  |  |  |  |  |  |  |  |  | Unrealized
|  | Fair Value |  | Basis |  | (Loss) Gain
Equity securities (a) |  | $ | 69 |  |  | $ | 4,307 |  |  | $ | (4,238 | )
Mutual funds (b) |  |  | 16,516 |  |  |  | 16,990 |  |  |  | (474 | )
Total |  | $ | 16,585 |  |  | $ | 21,297 |  |  | $ | (4,712 | )
Investment Income [Table Text Block] |
|  | Year Ended December 31,
|  | 2023 |  | 2022
Interest on cash and cash equivalents |  | $ | 1,566 |  |  | $ | 194 |
Dividends on marketable securities |  |  | — |  |  |  | 219 |
Net investment income |  | $ | 1,566 |  |  | $ | 413 |
Gain (Loss) on Securities [Table Text Block] |
|  | Year Ended December 31,
|  | 2023 |  | 2022
Marketable securities (a) |  | $ | 384 |  |  | $ | (4,747 | )
Net gains (losses) |  | $ | 384 |  |  | $ | (4,747 | )

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