Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 07, 2022
Number of Operating Segments		2
Effective Income Tax Rate Reconciliation, Insurance Captive, Percent	(0.40%)	(0.20%)	(0.40%)
Gain (Loss) on Disposition of Business	$ (0)	$ (870,000)	$ (0)
Mortgage Servicing Rights, Amortization Period (Year)	7 years
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 4,000,000	4,000,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance	0	0
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss	2,000,000	2,000,000
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance	$ 0	0
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	40 years
Landmark Financial Advisors, LLC (LFA) [Member]
Gain (Loss) on Disposition of Business		$ (870,000)
Kentucky Bancshares [Member]
Effective Income Tax Rate Reconciliation, Insurance Captive, Percent	0.20%	0.30%	0.20%
Commonwealth [Member]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 38,600,000
Landmark Financial Advisors, LLC (LFA) [Member]
Business Acquisition, Percentage of Voting Interests Acquired				60.00%
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 483,000