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Note 10 - Fair Value Measurements - Financial Assets and Liabilities, Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Total Fair Value | $ 688,071 | $ 183,145
Assets, fair value | 759,065 | 248,482
Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 571,253 | 77,204
Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 187,738 | 171,130
Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value | 74 | 148
Money Market Funds [Member] |  |
Total Fair Value | 500,259 | 11,867
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value | 500,259 | 11,867
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value | 0 | 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total Fair Value | 0 | 0
Certificates of Deposit [Member] |  |
Total Fair Value | 154,489 | 164,418
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value | 0 | 0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value | 154,489 | 164,418
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total Fair Value | 0 | 0
US Government Agencies Short-Term Debt Securities [Member] |  |
Total Fair Value | 33,249 |
US Government Agencies Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value | 0 |
US Government Agencies Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value | 33,249 |
US Government Agencies Short-Term Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total Fair Value | 0 |
Corporate Debt Securities [Member] |  |
Total Fair Value |  | 6,712
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value |  | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value |  | 6,712
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total Fair Value |  | 0
Auction Rate Securities [Member] |  |
Total Fair Value | 74 | 148
Auction Rate Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value | 0 | 0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value | 0 | 0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total Fair Value | 74 | 148
Mutual Fund [Member] |  |
Total Fair Value | 70,994 | 65,337
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value | 70,994 | 65,337
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value | 0 | 0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Total Fair Value | $ 0 | $ 0

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