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v3.26.1

Note 4 - Fair Value Measurements (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2026
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  | March 31, 2026 |  |  | December 31, 2025 |
| Fair Value Level1 |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds | Level 1 |  | $ | 2,852 |  |  | $ | — |  |  | $ | 2,852 |  |  | $ | 581 |  |  | $ | — |  |  | $ | 581 |
Municipal debt securities | Level 2 |  |  | 1,932 |  |  |  | — |  |  |  | 1,932 |  |  |  | 4,893 |  |  |  | (1 | ) |  |  | 4,892 |
Corporate debt securities | Level 2 |  |  | 11,653 |  |  |  | (17 | ) |  |  | 11,636 |  |  |  | 17,513 |  |  |  | (9 | ) |  |  | 17,504 |
Total investments |  | $ | 16,437 |  |  | $ | (17 | ) |  | $ | 16,420 |  |  | $ | 22,987 |  |  | $ | (10 | ) |  | $ | 22,977 |

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