Note 2 - Business Combinations - Identifiable Assets Acquired and Liabilities Assumed (Details) (Parentheticals)	6 Months Ended	12 Months Ended
	Dec. 31, 2024 $ / shares shares	Dec. 31, 2024 $ / shares shares
Cincinnati Bancorp, Inc. [Member]
Shares issued (in shares) | shares		2,042,598
Price per share (in dollars per share) | $ / shares	$ 13.99	$ 13.99
Shares issued (in shares) | shares		2,042,598
Price per share (in dollars per share) | $ / shares	$ 13.99	$ 13.99
Eagle Financial Bancorp, Inc. [Member]
Shares issued (in shares) | shares	868,001
Price per share (in dollars per share) | $ / shares	$ 14.04	14.04
Shares issued (in shares) | shares	868,001
Price per share (in dollars per share) | $ / shares	$ 14.04	$ 14.04