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Note 10 - Fair Value Measurements - Summary of Fair Value Measurements by Level (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Restricted cash and cash equivalents | $ 27,150 |  | $ 28,532
Available-for-sale securities (USD) | 124,316 | $ 127,727 |
Total financial assets | 398,104 |  |
Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 484 | 2,441 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Total financial assets | 359,403 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Total financial assets | 38,224 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Total financial assets | 477 |  |
Fair Value, Recurring [Member] |  |  |
Cash and cash equivalents | 93,982 | 107,076 |
Restricted cash and cash equivalents | 27,150 | 18,892 |
Total financial assets |  | 391,591 |
Fair Value, Recurring [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 152,656 | 137,896 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 59,882 | 60,171 |
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities (USD) | 17,438 | 17,659 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities (USD) | 43,004 | 45,850 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 3,992 | 4,047 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents | 93,982 | 107,076 |
Restricted cash and cash equivalents | 27,150 | 18,892 |
Total financial assets |  | 352,574 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 152,656 | 137,896 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 42,611 | 42,860 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities (USD) | 43,004 | 45,850 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Total financial assets |  | 38,568 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 17,271 | 17,311 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities (USD) | 16,961 | 17,210 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 3,992 | 4,047 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Total financial assets |  | 449 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities (USD) | $ 477 | $ 449 |

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