Note 11 - Deferred Compensation Plan - Summary of Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Deferred compensation plan assets	$ 67,765	$ 63,022
Deferred compensation plan liabilities	69,869	64,981
Other Long-term Assets [Member]
Deferred compensation plan assets	67,765	63,022
Accrued Compensation and Related Benefits [Member]
Deferred compensation plan liabilities	4,191	118
Other Long-term Liabilities [Member]
Deferred compensation plan liabilities	65,678	64,863
Cash Surrender Value [Member]
Deferred compensation plan assets	20,651	19,089
Mutual Funds and Money Market Funds, Fair Value [Member]
Deferred compensation plan assets	$ 47,114	$ 43,933