Note 18 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Benefit Plan, Employer Additional Contribution of Stock, Percent	2.00%
Defined Contribution Plan, Cost	$ 4,200,000	$ 3,300,000	$ 2,900,000
Defined Contribution Plan, Shares, Held in Employee Stock Ownership and Profit Sharing Plan (in shares)	423,000	445,000
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 221,000	$ 224,000	$ 214,000
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 11,200,000	10,800,000
Defined Benefit Plan, Number of Employees Covered	2
Defined Benefit Plan, Number of Retired Employees Covered	1
Defined Benefit Plan, Number of Present Employees Covered	1
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year)	25 years
Defined Benefit Plan, Accumulated Benefit Obligation	$ 2,300,000	$ 2,100,000