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Note 14 - Fair Value Measurements | 6 Months Ended
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Jun. 30, 2026
Notes to Financial Statements |
Financial Instruments Disclosure [Text Block] | 14. Fair Value Measurements Financial assets and liabilities measured at fair value on a recurring basis are classified in the categories described in the tables below:
|  | 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 |
(1) The majority of certificates of deposit are foreign deposits. (2) The fair value of mandatorily redeemable noncontrolling interest is based on discounted redemption value using risk-free rates offered for similar financing with the same remaining maturities. The following tables summarize the Company’s available-for-sale securities measured at fair value as of June 30, 2026 and December 31, 2025.
|  | 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 |
The contractual maturity of the available-for-sale securities held as of June 30, 2026 and December 31, 2025 was within one year.

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/825/tableOfContent + Details
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