Note 11 - Deferred Compensation Plan - Summary of Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Deferred compensation plan assets	$ 47,516	$ 53,172
Deferred compensation plan liabilities	49,535	55,771
Other Long-term Assets [Member]
Deferred compensation plan assets	47,516	53,172
Accrued Compensation and Related Benefits [Member]
Deferred compensation plan liabilities	118	282
Other Long-term Liabilities [Member]
Deferred compensation plan liabilities	49,417	55,489
Cash Surrender Value [Member]
Deferred compensation plan assets	18,376	21,386
Mutual Funds and Money Market Funds, Fair Value [Member]
Deferred compensation plan assets	$ 29,140	$ 31,786