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v3.25.3

Note 2 - Investments and Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Cash, Cash Equivalent, and Investment [Table Text Block] |
|  | September 30, 2025 |  |  | December 31, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Value |  |  | Cost |  |  | Gain |  |  | (Loss) |  |  | Value |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, restricted cash and cash equivalents |  | $ | 31,210 |  |  | $ | — |  |  | $ | — |  |  | $ | 31,210 |  |  | $ | 33,811 |  |  | $ | — |  |  | $ | — |  |  | $ | 33,811 |

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