Note 10 - Other Income (Expense), Net - Interest and Other Income Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest income	$ 27,093	$ 23,363	$ 14,369
Amortization of discount (premium) on available-for-sale securities, net	20,145	5,277	(4,375)
Gain (loss) on deferred compensation plan investments	9,400	8,505	(6,600)
Charitable contributions	(23,742)	(14,850)	(5,900)
Gain on sale of equity investment	(0)	1,424	(0)
Other	658	386	658
Total	$ 33,554	$ 24,105	$ (1,848)