Note 4 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 976,212	$ 958,564
Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	102	64
Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	2,066	2,066
Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	269	279
S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	1,765	885
S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	545	406
Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	53	45
Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	502	755
Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	273	294
Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	5,575	4,794
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	82,136	74,271
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	102	64
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		45
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	102	109
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	123,239	129,389
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	2,066	2,066
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	2,066	2,066
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	562,870	544,339
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	269	279
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	963	454
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	39	41
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	53	0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	1,324	774
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	64,547	57,717
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	11,872	11,914
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	662	223
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	662	223
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	37,196	37,871
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	140	208
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	506	365
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	646	573
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	89,399	98,132
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	502	755
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	273	294
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	775	1,049
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	4,953	4,931
Consumer Portfolio Segment [Member] | Other Loans [Member] | Equipment [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Crops [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Commercial 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Consumer Portfolio Segment [Member] | Other Loans [Member] | S F R 1st Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | S F R 2nd Deed [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Inventory [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process		0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Automobiles New [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Automobiles Used [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 0	$ 0