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Note 4 - Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  | September 30, 2025 |  |  | December 31, 2024 |
| Fair Value Level1 |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds | Level 1 |  | $ | 4,974 |  |  | $ | — |  |  | $ | 4,974 |  |  | $ | 2,092 |  |  | $ | — |  |  | $ | 2,092 |
Municipal debt securities | Level 2 |  |  | 4,993 |  |  |  | — |  |  |  | 4,993 |  |  |  | 3,458 |  |  |  | — |  |  |  | 3,458 |
Corporate debt securities | Level 2 |  |  | 15,085 |  |  |  | (8 | ) |  |  | 15,077 |  |  |  | 30,491 |  |  |  | (26 | ) |  |  | 30,465 |
Total investments |  | $ | 25,052 |  |  | $ | (8 | ) |  | $ | 25,044 |  |  | $ | 36,041 |  |  | $ | (26 | ) |  | $ | 36,015 |

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