Note 11 - Deferred Compensation Plan - Summary of Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deferred compensation plan assets	$ 70,899	$ 63,022
Deferred compensation plan liabilities	73,518	64,981
Other Long-term Assets [Member]
Deferred compensation plan assets	70,899	63,022
Accrued Compensation and Related Benefits [Member]
Deferred compensation plan liabilities	4,191	118
Other Long-term Liabilities [Member]
Deferred compensation plan liabilities	69,327	64,863
Cash Surrender Value [Member]
Deferred compensation plan assets	21,074	19,089
Mutual Funds and Money Market Funds, Fair Value [Member]
Deferred compensation plan assets	$ 49,825	$ 43,933