Note 16 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Cost	$ 14,200	$ 13,300	$ 12,800
Multiemployer Plans, Maximum Percent Funded Status for Red Zone	65.00%
Multiemployer Plans, Maximum Percent Funded Status for Orange Zone	80.00%
Multiemployer Plans, Maximum Percent Funded Status for Yellow Zone	80.00%
Multiemployer Plans, Maximum Percent Funded Status for Green Zone	80.00%
Non-Qualified Deferred Compensation Plan [Member]
Deferred Compensation Liability, Current, Total	$ 32,700	30,000
Deferred Compensation Liability, Classified, Noncurrent, Total	4,900	5,300
Deferred Profit Sharing [Member]
Defined Contribution Plan, Cost	$ 0	$ 0	$ 0