Note 17 - Retirement Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 01, 2024	Jul. 01, 2023
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	50.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	3.00%
Defined Benefit Plan, Funded Percentage				80.00%	80.00%
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	$ (1,000)	$ 55,000	$ 27,000
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	$ 138,000	$ 570,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.75%	5.70%
Defined Benefit Plan, Service Cost	$ 0	$ 0	0
Defined Benefit Plan, Interest Cost	$ 9,000	$ 26,000	$ 36,000
Pension Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.54%	4.83%	5.02%
Defined Benefit Plan, Service Cost	$ 0	$ 0	$ 0
Defined Benefit Plan, Interest Cost	72,000	77,000	$ 54,000
Defined Benefit Plan, Accumulated Benefit Obligation	1,428,000	1,573,000
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	1,000	(55,000)
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	0
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Deferred Compensation Plan, Accrued Interest, Percent	8.00%
Deferred Compensation Liability, Current and Noncurrent	$ 2,640,000	2,754,000
Cincinnati Bancorp, Inc. [Member]
Defined Benefit Plan, Funded Percentage				65.00%	80.00%
Citizens National Bank [Member]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 115,000	$ 122,000
Minimum [Member]
Defined Contribution Plan, Automatic Contribution For Employees, Benefit Reduction, Percent	5.00%
Automatic Annual Contribution Employees Hired After Plan Amendments, Percent	5.00%
Automatic Annual Contribution Employees Hired After Plan Amendments, Amount	$ 249,000
Maximum [Member]
Defined Contribution Plan, Automatic Contribution For Employees, Benefit Reduction, Percent	7.00%