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Note 4 - Loans and the Allowance for Credit Losses - Aging Analysis of the Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans, Total	$ 1,499,979	$ 1,018,571
90 Days and Still Accruing	0	0
Nonaccrual	15,029	4,105
Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	10,029	8,521
Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	964	1,372
Financial Asset, Past Due [Member]
Loans, Total	26,022	13,998
Financial Asset, Not Past Due [Member]
Loans, Total	1,473,957	1,004,573
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans, Total	162,497	78,194
90 Days and Still Accruing	0	0
Nonaccrual	508	355
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	513	1,074
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	188	533
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, Past Due [Member]
Loans, Total	1,209	1,962
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	161,288	76,232
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans, Total	154,366	119,110
90 Days and Still Accruing	0	0
Nonaccrual	10,540	567
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	0	273
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	341	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, Past Due [Member]
Loans, Total	10,881	840
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	143,485	118,270
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Loans, Total	981,685	646,951
90 Days and Still Accruing	0	0
Nonaccrual	1,798	1,579
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	6,038	1,954
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	0	82
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Loans, Total	7,836	3,615
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	973,849	643,336
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans, Total	49,055	53,285
90 Days and Still Accruing	0	0
Nonaccrual	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	909	2,133
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total		0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Past Due [Member]
Loans, Total	909	2,133
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	48,146	51,152
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Loans, Total	33,688	11,568
90 Days and Still Accruing	0	0
Nonaccrual	258	83
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	0	348
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	0	319
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Past Due [Member]
Loans, Total	258	750
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	33,430	10,818
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member]
Loans, Total	54,214	38,755
90 Days and Still Accruing	0	0
Nonaccrual	1,090	650
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	1,284	1,416
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	321	189
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, Past Due [Member]
Loans, Total	2,695	2,255
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	51,519	36,500
Consumer Portfolio Segment [Member]
Loans, Total	64,474	70,708
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans, Total	45,654	65,584
90 Days and Still Accruing	0	0
Nonaccrual	823	792
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	1,216	1,251
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	70	242
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, Past Due [Member]
Loans, Total	2,109	2,285
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	43,545	63,299
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans, Total	18,820	5,124
90 Days and Still Accruing	0	0
Nonaccrual	12	79
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	69	72
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	44	7
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, Past Due [Member]
Loans, Total	125	158
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financial Asset, Not Past Due [Member]
Loans, Total	$ 18,695	$ 4,966

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