Note 2 - Business Combinations (Details Textual)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Apr. 12, 2024 USD ($) $ / shares shares	Nov. 01, 2023 USD ($) $ / shares shares
Business Combination, Acquisition Related Costs	$ 3,442,000	$ 4,656,000	$ 0
Cincinnati Bancorp, Inc. [Member]
Business Acquisition, Stock To Be Received, Shares (in shares) | shares					0.9274
Business Acquisition, Cash For Stock Options (in dollars per share) | $ / shares					$ 17.21
Business Acquisition, Limitation of Stock, Percent					80.00%
Business Acquisition, Limitation of Cash, Percent					20.00%
Business Combination, Acquired Receivable, Fair Value					$ 231,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount					258,600,000
Business Combination, Acquired Receivables, Estimated Uncollectible					$ 1,722,000
Business Combination, Acquisition Related Costs	333,000	4,514,000
Cincinnati Bancorp, Inc. [Member] | Cincinnati, Ohio [Member]
Business Combination, Number of Operating Branches					4
Cincinnati Bancorp, Inc. [Member] | Florence, Kentucky [Member]
Business Combination, Number of Operating Branches					1
Eagle Financial Bancorp, Inc. [Member]
Business Combination, Number of Operating Branches				3
Business Acquisition, Stock To Be Received, Shares (in shares) | shares				1.1401
Business Acquisition, Cash For Stock Options (in dollars per share) | $ / shares				$ 19.1
Business Combination, Acquired Receivable, Fair Value				$ 101,700,000
Business Combination, Acquired Receivables, Gross Contractual Amount				112,500,000
Business Combination, Acquired Receivables, Estimated Uncollectible				$ 763,000
Business Combination, Acquisition Related Costs	$ 3,109,000	$ 142,000
Eagle Financial Bancorp, Inc. [Member] | Minimum [Member]
Business Acquisition, Limitation of Stock, Percent				60.00%
Eagle Financial Bancorp, Inc. [Member] | Maximum [Member]
Business Acquisition, Limitation of Stock, Percent				70.00%