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Note 4 - Loans (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Jan. 01, 2023	Dec. 31, 2022
Financing Receivable, Accrued Interest, after Allowance for Credit Loss	$ 3,680,000		$ 3,680,000
Underwriting Standards, Loan to Value Percentage	80.00%		80.00%
Underwriting Standards, Housing Percentage	36.00%		36.00%
Underwriting Standards, Total Debt Ratio	42.00%		42.00%
Financing Receivable, Nonaccrual	$ 0		$ 0			$ 0
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 1,075,138,000		$ 1,075,138,000			1,016,579,000
Financing Receivable, Minimum Cash Collateral Percent	110.00%		110.00%
Financing Receivable, Allowance for Credit Loss	$ 11,479,000	$ 9,738,000	$ 11,479,000	$ 9,738,000	$ 11,121,000	10,896,000	$ 9,411,000		$ 9,468,000
Financing Receivable, Allowance for Credit Loss, Recovery	1,992,000	38,000	2,242,000	124,000
(Reversal of) provision for credit losses	(1,620,000)	300,000	(1,620,000)	(160,000)
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	1,075,136,000		1,075,136,000			1,016,579,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss									346,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss								$ 346,000
Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	0		0			0
Collateral Pledged [Member]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 0		$ 0			0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans	86.00%		86.00%
Commercial Portfolio Segment [Member]
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans	8.00%		8.00%
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 81,439,000		$ 81,439,000			65,218,000
Financing Receivable, Allowance for Credit Loss	895,000	527,000	895,000	527,000	1,177,000	650,000	600,000		612,000
Financing Receivable, Allowance for Credit Loss, Recovery	0	0	0	12,000
(Reversal of) provision for credit losses	$ (282,000)	(73,000)	$ 245,000	(187,000)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss									102,000
Residential Real Estate and Other Consumer Loans [Member]
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans	3.00%		3.00%
Agriculture [Member]
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans	3.00%		3.00%
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 30,776,000		$ 30,776,000			25,922,000
Financing Receivable, Allowance for Credit Loss	105,000	38,000	105,000	38,000	$ 101,000	$ 47,000	$ 39,000		172,000
Financing Receivable, Allowance for Credit Loss, Recovery	0	0	0	0
(Reversal of) provision for credit losses	$ 4,000	$ (1,000)	$ 58,000	$ 3,000
Agriculture [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss									$ (137,000)

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