Note 17 - Employee Benefit Plans (Details Textual)	12 Months Ended
	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)
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	$ 5,100,000	$ 4,500,000	$ 4,200,000
Defined Contribution Plan, Shares, Held in Employee Stock Ownership and Profit Sharing Plan | shares	405,000	427,000
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 323,000	$ 296,000	$ 221,000
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 12,000,000	12,000,000
Defined Benefit Plan, Number of Employees Covered	2
Deferred Compensation Arrangement with Individual, Requisite Service Period	25 years
Defined Benefit Plan, Accumulated Benefit Obligation	$ 2,300,000	$ 2,300,000