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Note 4 - Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  | June 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 |  | $ | 1,951 |  |  | $ | — |  |  | $ | 1,951 |  |  | $ | 2,092 |  |  | $ | — |  |  | $ | 2,092 |
Municipal debt securities | Level 2 |  |  | 6,797 |  |  |  | (1 | ) |  |  | 6,796 |  |  |  | 3,458 |  |  |  | — |  |  |  | 3,458 |
Corporate debt securities | Level 2 |  |  | 18,328 |  |  |  | (17 | ) |  |  | 18,311 |  |  |  | 30,491 |  |  |  | (26 | ) |  |  | 30,465 |
Total investments |  | $ | 27,076 |  |  | $ | (18 | ) |  | $ | 27,058 |  |  | $ | 36,041 |  |  | $ | (26 | ) |  | $ | 36,015 |

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