Note 12 - Employee Stock Ownership Plan (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2014	Dec. 31, 2005
Stock Issued During Period, Shares, Employee Stock Ownership Plan (in shares)				2,107,561
Stock Issued During Period, Additional Shares Employee Stock Ownership Plan (in shares)				2,024,000
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 1.9	$ 2.3	$ 1.8
Employee Stock Ownership Plan2005 Plan [Member]
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Amount				$ 23.8	$ 8.5
Stock Issued During Period, Shares, Employee Stock Ownership Plan (in shares)				83,561	835,610