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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