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Note 14 - Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | June 30, 2026 |
|  | (in thousands) |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit (1) |  | $ | — |  |  | $ | 7,557 |  |  | $ | — |  |  | $ | 7,557 |
Money market funds |  |  | — |  |  |  | 5,213 |  |  |  | — |  |  |  | 5,213 |
U.S. treasury bills |  |  | — |  |  |  | 292,368 |  |  |  | — |  |  |  | 292,368 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit (1) |  |  | — |  |  |  | 198 |  |  |  | — |  |  |  | 198 |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit (1) |  |  | — |  |  |  | 224 |  |  |  | — |  |  |  | 224 |
Total |  | $ | — |  |  | $ | 305,560 |  |  | $ | — |  |  | $ | 305,560 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily redeemable noncontrolling interest (2) |  | $ | — |  |  | $ | — |  |  | $ | 2,742 |  |  | $ | 2,742 |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily redeemable noncontrolling interest (2) |  |  | — |  |  |  | — |  |  |  | 2,907 |  |  |  | 2,907 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 5,649 |  |  | $ | 5,649 |
|  | December 31, 2025 |
|  | (in thousands) |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit (1) |  | $ | — |  |  | $ | 1,734 |  |  | $ | — |  |  | $ | 1,734 |
Money market funds |  |  | — |  |  |  | 4,215 |  |  |  | — |  |  |  | 4,215 |
U.S. treasury bills |  |  | — |  |  |  | 189,012 |  |  |  | — |  |  |  | 189,012 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit (1) |  |  | — |  |  |  | 213 |  |  |  | — |  |  |  | 213 |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit (1) |  |  | — |  |  |  | 206 |  |  |  | — |  |  |  | 206 |
Total |  | $ | — |  |  | $ | 195,380 |  |  | $ | — |  |  | $ | 195,380 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily redeemable noncontrolling interest (2) |  | $ | — |  |  | $ | — |  |  | $ | 1,839 |  |  | $ | 1,839 |
Other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily redeemable noncontrolling interest (2) |  |  | — |  |  |  | — |  |  |  | 3,704 |  |  |  | 3,704 |
Total |  | $ | — |  |  | $ | — |  |  | $ | 5,543 |  |  | $ | 5,543 |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | June 30, 2026 |
|  | (in thousands) |
|  | Amortized Cost |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. treasury bills |  | $ | 292,391 |  |  | $ | 292,368 |  |  | $ | (23 | )
Total |  | $ | 292,391 |  |  | $ | 292,368 |  |  | $ | (23 | )
|  | December 31, 2025 |
|  | (in thousands) |
|  | Amortized Cost |  |  | Fair Value |  |  | Gross Unrealized Gains |
U.S. treasury bills |  | $ | 189,007 |  |  | $ | 189,012 |  |  | $ | 5 |
Total |  | $ | 189,007 |  |  | $ | 189,012 |  |  | $ | 5 |

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