Note 20 - Regulatory Matters (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions					12 Months Ended
	Oct. 12, 2023	Jul. 13, 2023	Apr. 13, 2023	Jan. 12, 2023	Dec. 31, 2023	Dec. 31, 2022	May 31, 2021	Dec. 31, 2009
Capital Conservation Buffer					2.50%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy to Risk Weighted Assets					0.07
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets					0.085
Capital Required for Capital Adequacy to Risk Weighted Assets					0.105
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval					$ 151.0
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.34	$ 0.34	$ 0.33	$ 0.33
Stock Repurchase Program, Remaining Authorized Repurchase Amount					$ 6.8
Stock Repurchase Program, Authorized Amount							$ 20.0
Stock Repurchased During Period, Shares (in shares)					0	0
Preferred Securities of Subsidiary Trust					$ 47.6	$ 46.9
Maximum Restricted Core Element Allowed in Tier One Capital Percent					25.00%
Maximum Level of Consolidated Aggregate Assets Allowing for Inclusion of Trust Preferred Securities in Tier One Capital								$ 15,000.0
Trust Preferred Securities Included in Tier One Capital					$ 47.6	$ 46.9