Note 5 - Loans and the Allowance for Credit Losses - Aging Analysis of the Loan Portfolio (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Loans, Total	$ 1,515,793,000	$ 1,018,571,000
90 Days and Still Accruing	0	0
Nonaccrual	15,089,000	4,105,000
Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	7,668,000	8,521,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	923,000	1,372,000
Financial Asset, Past Due [Member]
Loans, Total	23,680,000	13,998,000
Financial Asset, Not Past Due [Member]
Loans, Total	1,492,113,000	1,004,573,000
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, Total	168,696,000	78,194,000
90 Days and Still Accruing	0	0
Nonaccrual	611,000	355,000
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	2,809,000	1,074,000
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	572,000	533,000
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Financial Asset, Past Due [Member]
Loans, Total	3,992,000	1,962,000
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	164,704,000	76,232,000
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member]
Loans, Total	157,768,000	119,110,000
90 Days and Still Accruing	0	0
Nonaccrual	10,509,000	567,000
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	395,000	273,000
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	0	0
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Financial Asset, Past Due [Member]
Loans, Total	10,904,000	840,000
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	146,864,000	118,270,000
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans, Total	1,003,944,000	646,951,000
90 Days and Still Accruing	0	0
Nonaccrual	2,000,000	1,579,000
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	1,160,000	1,954,000
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	0	82,000
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Past Due [Member]
Loans, Total	3,160,000	3,615,000
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	1,000,784,000	643,336,000
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Loans, Total	40,022,000	53,285,000
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	1,466,000	2,133,000
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	0	0
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, Past Due [Member]
Loans, Total	1,466,000	2,133,000
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	38,556,000	51,152,000
Residential Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans, Total	33,142,000	11,568,000
90 Days and Still Accruing	0	0
Nonaccrual	215,000	83,000
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	15,000	348,000
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	0	319,000
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Past Due [Member]
Loans, Total	230,000	750,000
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	32,912,000	10,818,000
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member]
Loans, Total	54,594,000	38,755,000
90 Days and Still Accruing	0	0
Nonaccrual	988,000	650,000
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	835,000	1,416,000
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	191,000	189,000
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Financial Asset, Past Due [Member]
Loans, Total	2,014,000	2,255,000
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	52,580,000	36,500,000
Consumer Portfolio Segment [Member]
Loans, Total	57,627,000	70,708,000
Consumer Portfolio Segment [Member] \| Automobile Loan [Member]
Loans, Total	40,020,000	65,584,000
90 Days and Still Accruing	0	0
Nonaccrual	745,000	792,000
Consumer Portfolio Segment [Member] \| Automobile Loan [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	943,000	1,251,000
Consumer Portfolio Segment [Member] \| Automobile Loan [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	159,000	242,000
Consumer Portfolio Segment [Member] \| Automobile Loan [Member] \| Financial Asset, Past Due [Member]
Loans, Total	1,847,000	2,285,000
Consumer Portfolio Segment [Member] \| Automobile Loan [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	38,173,000	63,299,000
Consumer Portfolio Segment [Member] \| Other Loans [Member]
Loans, Total	17,607,000	5,124,000
90 Days and Still Accruing	0	0
Nonaccrual	21,000	79,000
Consumer Portfolio Segment [Member] \| Other Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans, Total	45,000	72,000
Consumer Portfolio Segment [Member] \| Other Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans, Total	1,000	7,000
Consumer Portfolio Segment [Member] \| Other Loans [Member] \| Financial Asset, Past Due [Member]
Loans, Total	67,000	158,000
Consumer Portfolio Segment [Member] \| Other Loans [Member] \| Financial Asset, Not Past Due [Member]
Loans, Total	$ 17,540,000	$ 4,966,000

Note 5 - Loans and the Allowance for Credit Losses - Aging Analysis of the Loan Portfolio (Details) - USD ($)

Dec. 31, 2025

Dec. 31, 2024

Loans, Total

$ 1,515,793,000

$ 1,018,571,000

90 Days and Still Accruing

Nonaccrual

15,089,000

4,105,000

Financial Asset, 30 to 59 Days Past Due [Member]

Loans, Total