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v3.24.3

Note 4 - Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  | September 30, 2024 |  |  | December 31, 2023 |
| Fair Value Level1 |  | Adjusted Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Fair Value |  |  | Adjusted Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Fair Value |
Money market funds | Level 1 |  | $ | 8,048 |  |  | $ | — |  |  | $ | 8,048 |  |  | $ | 213 |  |  | $ | — |  |  | $ | 213 |
Municipal debt securities | Level 2 |  |  | 6,741 |  |  |  | 2 |  |  |  | 6,743 |  |  |  | 1,426 |  |  |  | 1 |  |  |  | 1,427 |
Corporate debt securities | Level 2 |  |  | 23,121 |  |  |  | (7 | ) |  |  | 23,114 |  |  |  | 45,580 |  |  |  | (13 | ) |  |  | 45,567 |
Total investments |  | $ | 37,910 |  |  | $ | (5 | ) |  | $ | 37,905 |  |  | $ | 47,219 |  |  | $ | (12 | ) |  | $ | 47,207 |

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