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Note 10 - Fair Value Measurements - Summary of Fair Value Measurements by Level (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Restricted cash and cash equivalents | $ 29,391 |  | $ 24,413
Available-for-sale securities (USD) | 119,795 | $ 127,727 |
Total financial assets | 440,283 |  |
Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 488 | 2,441 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Total financial assets | 403,751 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Total financial assets | 36,054 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Total financial assets | 478 |  |
Fair Value, Recurring [Member] |  |  |
Cash and cash equivalents | 136,214 | 107,076 |
Restricted cash and cash equivalents | 29,391 | 18,892 |
Total financial assets |  | 391,591 |
Fair Value, Recurring [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 154,883 | 137,896 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 56,024 | 60,171 |
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities (USD) | 16,924 | 17,659 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities (USD) | 43,094 | 45,850 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 3,753 | 4,047 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents | 136,214 | 107,076 |
Restricted cash and cash equivalents | 29,391 | 18,892 |
Total financial assets |  | 352,574 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 154,883 | 137,896 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 40,169 | 42,860 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities (USD) | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities (USD) | 43,094 | 45,850 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and cash equivalents | 0 | 0 |
Restricted cash and cash equivalents | 0 | 0 |
Total financial assets |  | 38,568 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 15,855 | 17,311 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities (USD) | 16,446 | 17,210 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities (USD) | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 3,753 | 4,047 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and cash equivalents | 0 | 0 |
Restricted cash and cash equivalents | 0 | 0 |
Total financial assets |  | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities (USD) | 478 | 449 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities (USD) | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities (USD) | $ 0 | $ 0 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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