Note 4 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	$ 1,495,545	$ 1,512,056
Equipment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	334	111
Crops [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	4,471	4,873
Livestock [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	225	225
Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	648	2,749
Commercial 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	7,869	3,640
S F R 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	4,418	862
S F R 2nd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	503	510
Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	699
SFR 3rd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process		37
Collateral Pledged [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	19,167	13,007
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	159,905	167,851
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Equipment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	225	111
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Crops [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Livestock [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Farmland [Member]
Financing Receivable, Excluding Accrued Interest, 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, Excluding Accrued Interest, 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, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	161
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| S F R 2nd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	287	0
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	532
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| SFR 3rd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process		0
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Collateral Pledged [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	1,044	272
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	139,336	157,526
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Equipment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	109	0
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Crops [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	4,471	4,873
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Livestock [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	225	225
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	648	2,749
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Commercial 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	2,241	2,241
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| S F R 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	4,171	311
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| S F R 2nd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| SFR 3rd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process		0
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Collateral Pledged [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	11,865	10,399
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	1,015,901	1,002,627
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Equipment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Crops [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Livestock [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Farmland [Member]
Financing Receivable, Excluding Accrued Interest, 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, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	5,628	1,399
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| S F R 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	245
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| S F R 2nd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	112
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	27
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| SFR 3rd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process		37
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Collateral Pledged [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	5,655	1,793
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	54,411	40,168
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Equipment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Crops [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Livestock [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Commercial 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, 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, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| S F R 2nd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	140
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Collateral Pledged [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	140
Residential Portfolio Segment [Member] \| Real Estate Loan [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	31,238	33,116
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Equipment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Crops [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Livestock [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Farmland [Member]
Financing Receivable, Excluding Accrued Interest, 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, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| S F R 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	145	145
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| S F R 2nd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| SFR 3rd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process		0
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Collateral Pledged [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	145	145
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	54,389	53,647
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Equipment [Member]
Financing Receivable, Excluding Accrued Interest, 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, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Livestock [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Farmland [Member]
Financing Receivable, Excluding Accrued Interest, 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, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0	0
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| S F R 1st Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	102
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| S F R 2nd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	216	398
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	0
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| SFR 3rd Deed [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process		0
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Collateral Pledged [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process	$ 318	$ 398

Note 4 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($)
$ in Thousands

Sep. 30, 2026

Dec. 31, 2025

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process

$ 1,495,545

$ 1,512,056

Equipment [Member]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process

334

111

Crops [Member]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process