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Note 10 - Fair Value Measurements - Summary of Fair Value Measurements by Level (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restricted cash and cash equivalents	$ 20,801	$ 18,892	$ 16,198
Available-for-sale securities	119,804	127,727
Total financial assets	379,980
Corporate Debt Securities [Member]
Available-for-sale securities	0	2,441
Fair Value, Inputs, Level 1 [Member]
Total financial assets	348,824
Fair Value, Inputs, Level 2 [Member]
Total financial assets	31,156
Fair Value, Recurring [Member]
Cash and cash equivalents	76,121	107,076
Restricted cash and cash equivalents	20,801	18,892
Total financial assets		391,591
Fair Value, Recurring [Member] \| Equity Securities [Member]
Marketable equity securities	163,254	137,896
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities	57,471	60,171
Fair Value, Recurring [Member] \| Asset-Backed Securities [Member]
Available-for-sale securities	14,410	17,659
Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Available-for-sale securities	44,186	45,850
Fair Value, Recurring [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	3,737	4,047
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	76,121	107,076
Restricted cash and cash equivalents	20,801	18,892
Total financial assets		352,574
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Marketable equity securities	163,254	137,896
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities	43,656	42,860
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	44,186	45,850
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	806	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	13,815	17,311
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Asset-Backed Securities [Member]
Available-for-sale securities	14,410	17,210
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	$ 2,931	4,047
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents		0
Restricted cash and cash equivalents		0
Total financial assets		449
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities [Member]
Marketable equity securities		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Available-for-sale securities		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Asset-Backed Securities [Member]
Available-for-sale securities		449
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member]
Available-for-sale securities		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities		$ 0