Note 5 - Loans and Allowance for Credit Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended				12 Months Ended
	Sep. 30, 2024		Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023		Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	$ 38,332		$ 35,696	$ 35,843		$ 31,146		$ 31,146
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	1,126	[1]	0	6,195	[2]	460	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	(505)		(151)	(3,444)		(516)		(613)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	189		745	548		1,343
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	39,142		36,290	39,142		36,290		35,843
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						3,857		3,857
Consumer Borrower [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	7,352		10,114	7,872		7,674		7,674
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	784	[1]	(465)	183	[2]	(146)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	(161)		(17)	(177)		(122)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	2		27	99		108
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	7,977		9,659	7,977		9,659		7,872
Consumer Borrower [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						2,145		2,145
Consumer Borrower [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	6,234		8,170	9,705		8,690		8,690
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	660	[1]	93	(159)	[2]	(126)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	(246)		(134)	(3,140)		(394)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	153		456	395		950
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	6,801		8,585	6,801		8,585		9,705
Consumer Borrower [Member] | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						(535)		(535)
Consumer Borrower [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	7,024		9,803	7,671		7,143		7,143
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	594	[1]	(399)	(124)	[2]	42	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		(9)	(3)		(86)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		3	74		57
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	7,618		9,398	7,618		9,398		7,671
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						2,242		2,242
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	5,366		7,571	6,087		5,495		5,495
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	74	[1]	(317)	(647)	[2]	(43)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		(9)	0		(9)		(9)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		0	0		2
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	5,440		7,245	5,440		7,245		6,087
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						1,800		1,800
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	458		785	485		345		345
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	(355)	[1]	(22)	(382)	[2]	(50)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		0	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	103		763	103		763		485
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						468		468
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	886		1,117	835		951		951
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	68	[1]	(54)	119	[2]	50	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0		(40)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		3	0		6
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	954		1,066	954		1,066		835
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						59		59
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	314		330	264		352		352
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	807	[1]	(6)	786	[2]	85	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	(3)		(77)		(77)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		0	74		49
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	1,121		324	1,121		324		264
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						(85)		(85)
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	328		311	201		531		531
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	190	[1]	(66)	307	[2]	(188)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	(161)		(8)	(174)		(36)		(51)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	2		24	25		51
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	359		261	359		261		201
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						(97)		(97)
Commercial Borrower [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	30,980		25,582	27,971		23,472		23,472
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	342	[1]	465	6,012	[2]	606	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	(344)		(134)	(3,267)		(394)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	187		718	449		1,235
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	31,165		26,631	31,165		26,631		27,971
Commercial Borrower [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						1,712		1,712
Commercial Borrower [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs				(3,140)				(436)
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	24,302		17,171	18,086		14,251		14,251
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	(313)	[1]	399	5,912	[2]	888	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	(98)		0	(127)		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	14		262	34		284
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	23,905		17,832	23,905		17,832		18,086
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						2,409		2,409
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	10,820		3,731	6,135		1,458		1,458
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	(447)	[1]	770	4,238	[2]	492	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		251	0		251
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	10,373		4,752	10,373		4,752		6,135
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						2,551		2,551
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	2,430		1,991	1,776		1,062		1,062
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	161	[1]	(25)	815	[2]	1,066	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		0	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	2,591		1,966	2,591		1,966		1,776
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						(162)		(162)
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	8,772		8,555	7,726		7,543		7,543
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	(260)	[1]	(198)	786	[2]	(530)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		0	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	8,512		8,357	8,512		8,357		7,726
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						1,344		1,344
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	2,280		2,894	2,449		4,188		4,188
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	233	[1]	(148)	73	[2]	(140)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	(98)		0	(127)		0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	14		11	34		33
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	2,429		2,757	2,429		2,757		2,449
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						(1,324)		(1,324)
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	444		241	180		531		531
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	(5)	[1]	(27)	259	[2]	(156)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	20		0	20		1
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	459		214	459		214		180
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						(162)		(162)
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	259		138	96		281		281
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	(2)	[1]	(22)	161	[2]	(80)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	20		0	20		1
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	277		116	277		116		96
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						(86)		(86)
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance	185		103	84		250		250
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions	(3)	[1]	(5)	98	[2]	(76)	[3]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs	0		0	0		0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recoveries	0		0	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Ending Balance	$ 182		$ 98	$ 182		98		84
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance						$ (76)		$ (76)

[1] The difference in the credit loss expense reported herein compared to the consolidated statements of income is associated with the credit loss expense of $549 thousand related to off-balance sheet credit exposure and ($14) thousand related to HTM investment securities.

[2] The difference in the credit loss expense reported herein compared to the consolidated statements of income is associated with the credit loss expense of $31 thousand related to off-balance sheet credit exposure and ($76) thousand related to HTM investment securities.

[3] The difference in the credit loss expense reported herein compared to the consolidated statements of income is associated with the credit loss expense of $44 thousand related to off-balance sheet credit exposure and $46 thousand related to HTM investment securities.