Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Deferred Compensation Plan [Table Text Block]

	December 31,
	2023		2022
Deferred compensation plan asset components:
Cash surrender value of corporate-owned life insurance policies	$	23,545	$	19,089
Fair value of mutual funds and money market funds		54,836		43,933
Total	$	78,381	$	63,022
Deferred compensation plan assets reported in:
Other long-term assets	$	78,381	$	63,022
Deferred compensation plan liabilities reported in:
Accrued compensation and related benefits (short-term)	$	384	$	118
Other long-term liabilities		80,903		64,863
Total	$	81,287	$	64,981