Note 4 - Loans and the Allowance for Credit Losses - Aging Analysis of the Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Total, gross	$ 979,298	$ 961,471
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	5,610	4,820
Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	3,373	3,259
Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	6,307	1,138
Financial Asset, Past Due [Member]
Total, gross	15,290	9,217
Financial Asset, Not Past Due [Member]
Total, gross	964,008	952,254
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Total, gross	82,846	74,933
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	124	132
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	385	21
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	175	254
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, Past Due [Member]
Total, gross	684	407
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, Not Past Due [Member]
Total, gross	82,162	74,526
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Total, gross	123,523	129,678
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	2,066	2,066
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	22	82
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	4,977	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, Past Due [Member]
Total, gross	7,065	2,148
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, Not Past Due [Member]
Total, gross	116,458	127,530
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Total, gross	563,095	544,214
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	1,324	774
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	1,316	587
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	0	0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total, gross	2,640	1,361
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total, gross	560,455	542,853
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Total, gross	64,161	57,360
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	624	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Total, gross	624	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Total, gross	63,537	57,360
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Total, gross	11,900	11,942
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	662	223
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	0	348
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	157	423
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Total, gross	819	994
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Total, gross	11,081	10,948
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member]
Total, gross	38,041	38,713
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	646	572
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	155	473
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	0	53
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, Past Due [Member]
Total, gross	801	1,098
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, Not Past Due [Member]
Total, gross	37,240	37,615
Consumer Portfolio Segment [Member]
Total, gross	95,732	104,631
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Total, gross	90,737	99,660
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	785	1,049
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	1,485	1,729
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	332	405
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, Past Due [Member]
Total, gross	2,602	3,183
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, Not Past Due [Member]
Total, gross	88,135	96,477
Consumer Portfolio Segment [Member] | Other Loans [Member]
Total, gross	4,995	4,971
90 Days and Still Accruing	0	0
Financing Receivable, Nonaccrual	3	4
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total, gross	10	19
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total, gross	42	3
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, Past Due [Member]
Total, gross	55	26
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, Not Past Due [Member]
Total, gross	$ 4,940	$ 4,945