Note 15 - Shareholders' Equity and Regulatory Matters - (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
	Sep. 01, 2022	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 23, 2023	Oct. 22, 2020
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)			$ 0.5	$ 0.48
Preferred Stock, Dividends, Per Share, Cash Paid (in dollars per share)		$ 18.75	$ 75	$ 18.75
Stock Repurchased and Retired During Period, Value					$ 10,923,000
Preferred Stock, Dividend Rate, Percentage	7.50%
Proceeds from Issuance of Preferred Stock	$ 72,000,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate	4.70%
The 2020 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount								$ 30,000,000
Stock Repurchased and Retired During Period, Value					$ 10,900,000	$ 798,000
The 2023 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount							$ 30,000,000
Stock Repurchased and Retired During Period, Value			$ 0