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Note 10 - Fair Value Measurements - Summary of Fair Value Measurements by Level (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Restricted cash and cash equivalents | $ 25,775 |  | $ 27,150
Available-for-sale securities | 120,167 | $ 119,804 |
Corporate Debt Securities [Member] |  |  |
Available-for-sale securities | 57,223 | 57,471 |
Fair Value, Recurring [Member] |  |  |
Cash and cash equivalents | 90,386 | 76,121 |
Restricted cash and cash equivalents | 25,775 | 20,801 |
Total financial assets | 410,810 | 379,980 |
Fair Value, Recurring [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 174,482 | 163,254 |
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities | 57,223 | 57,471 |
Fair Value, Recurring [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities | 14,263 | 14,410 |
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities | 44,952 | 44,186 |
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities | 3,729 | 3,737 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents | 90,386 | 76,121 |
Restricted cash and cash equivalents | 25,775 | 20,801 |
Total financial assets | 377,254 | 348,824 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Marketable equity securities | 174,482 | 163,254 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities | 40,855 | 43,656 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities | 44,952 | 44,186 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities | 804 | 806 |
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 | 33,556 | 31,156 |
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 | 16,368 | 13,815 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities | 14,263 | 14,410 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities | 2,925 | 2,931 |
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 | 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 | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] |  |  |
Available-for-sale securities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |  |  |
Available-for-sale securities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale securities | $ 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/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: 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 5: 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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