Note 1 - Summary of Significant Accounting Policies - Summary of Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred compensation plan assets	$ 92,586	$ 78,381
Deferred compensation plan liabilities	95,976	81,287
Other Long-term Assets [Member]
Deferred compensation plan assets	92,586	78,381
Accrued Compensation and Related Benefits [Member]
Deferred compensation plan liabilities	2,323	384
Other Long-term Liabilities [Member]
Deferred compensation plan liabilities	93,653	80,903
Cash Surrender Value [Member]
Deferred compensation plan assets	27,249	23,545
Mutual Funds and Money Market Funds, Fair Value [Member]
Deferred compensation plan assets	$ 65,337	$ 54,836