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v3.23.2

Note 4 - Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  | June 30, 2023 |  |  | December 31, 2022 |
| Fair Value Level1 |  | Adjusted Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Fair Value |  |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds | Level 1 |  | $ | 994 |  |  | $ | — |  |  | $ | 994 |  |  | $ | 2,143 |  |  | $ | — |  |  | $ | 2,143 |
Government and municipal debt securities | Level 2 |  |  | 28,343 |  |  |  | 2 |  |  |  | 28,345 |  |  |  | 6,759 |  |  |  | — |  |  |  | 6,759 |
Corporate debt securities | Level 2 |  |  | 21,173 |  |  |  | (10 | ) |  |  | 21,163 |  |  |  | 47,947 |  |  |  | (16 | ) |  |  | 47,931 |
Total investments |  | $ | 50,510 |  |  | $ | (8 | ) |  | $ | 50,502 |  |  | $ | 56,849 |  |  | $ | (16 | ) |  | $ | 56,833 |

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