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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans by Loan Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Recorded Investment with no related allowance recorded	$ 550	$ 572	$ 3,958
Unpaid Principal Balance with no related allowance recorded	595	694	4,969
Average Recorded Investment with no related allowance recorded	518	2,555	2,404
Interest Income Recognized with no related allowance recorded	1	5	19
Recorded Investment with an allowance recorded	2,296	4,861	3,893
Unpaid Principal Balance with an allowance recorded	2,330	4,943	3,986
Related Allowance	153	503	431
Average Recorded Investment with an allowance recorded	3,191	4,736	3,506
Interest Income Recognized with an allowance recorded	122	218	134
Recorded Investment	2,846	5,433	7,851
Unpaid Principal Balance	2,925	5,637	8,955
Average Recorded Investment	3,709	7,291	5,910
Interest Income Recognized with an allowance recorded	123	223	153
Agricultural [Member]
Recorded Investment with no related allowance recorded	0	314	348
Unpaid Principal Balance with no related allowance recorded	0	428	434
Average Recorded Investment with no related allowance recorded	250	598	329
Interest Income Recognized with no related allowance recorded	0	0	0
Recorded Investment with an allowance recorded	23	2,302	0
Unpaid Principal Balance with an allowance recorded	27	2,302	0
Related Allowance	2	251	0
Average Recorded Investment with an allowance recorded	913	1,873	152
Interest Income Recognized with an allowance recorded	2	139	0
Recorded Investment	23	2,616	348
Unpaid Principal Balance	27	2,730	434
Average Recorded Investment	1,163	2,471	481
Interest Income Recognized with an allowance recorded	2	139	0
Commercial and Industrial [Member]
Recorded Investment with no related allowance recorded	0	0	1,516
Unpaid Principal Balance with no related allowance recorded	0	0	1,629
Average Recorded Investment with no related allowance recorded	18	596	464
Interest Income Recognized with no related allowance recorded	0	0	2
Recorded Investment with an allowance recorded	177	339	147
Unpaid Principal Balance with an allowance recorded	177	363	147
Related Allowance	14	95	19
Average Recorded Investment with an allowance recorded	209	226	111
Interest Income Recognized with an allowance recorded	13	5	12
Recorded Investment	177	339	1,663
Unpaid Principal Balance	177	363	1,776
Average Recorded Investment	227	822	575
Interest Income Recognized with an allowance recorded	13	5	14
Consumer Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	0	0	0
Unpaid Principal Balance with no related allowance recorded	0	0	0
Average Recorded Investment with no related allowance recorded	0	0	1
Interest Income Recognized with no related allowance recorded	0	0	0
Recorded Investment with an allowance recorded	7	14	8
Unpaid Principal Balance with an allowance recorded	7	15	8
Related Allowance	1	2	1
Average Recorded Investment with an allowance recorded	14	4	16
Interest Income Recognized with an allowance recorded	1	0	0
Recorded Investment	7	14	8
Unpaid Principal Balance	7	15	8
Average Recorded Investment	14	4	17
Interest Income Recognized with an allowance recorded	1	0	0
Construction Real Estate [Member]
Recorded Investment with no related allowance recorded	0	0	80
Unpaid Principal Balance with no related allowance recorded	0	0	80
Average Recorded Investment with no related allowance recorded	0	16	16
Interest Income Recognized with no related allowance recorded	0	0	0
Recorded Investment with an allowance recorded	0	0	0
Unpaid Principal Balance with an allowance recorded	0	0	0
Related Allowance	0	0	0
Average Recorded Investment with an allowance recorded	0	0	0
Interest Income Recognized with an allowance recorded	0	0	0
Recorded Investment	0	0	80
Unpaid Principal Balance	0	0	80
Average Recorded Investment	0	16	16
Interest Income Recognized with an allowance recorded	0	0	0
Commercial Real Estate Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	0	94	1,852
Unpaid Principal Balance with no related allowance recorded	0	94	2,664
Average Recorded Investment with no related allowance recorded	19	1,117	1,495
Interest Income Recognized with no related allowance recorded	0	5	14
Recorded Investment with an allowance recorded	165	179	1,180
Unpaid Principal Balance with an allowance recorded	165	179	1,180
Related Allowance	5	9	157
Average Recorded Investment with an allowance recorded	158	456	897
Interest Income Recognized with an allowance recorded	13	10	35
Recorded Investment	165	273	3,032
Unpaid Principal Balance	165	273	3,844
Average Recorded Investment	177	1,573	2,392
Interest Income Recognized with an allowance recorded	13	15	49
Residential Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	550	164	162
Unpaid Principal Balance with no related allowance recorded	595	172	162
Average Recorded Investment with no related allowance recorded	231	228	99
Interest Income Recognized with no related allowance recorded	1	0	3
Recorded Investment with an allowance recorded	1,924	2,027	2,558
Unpaid Principal Balance with an allowance recorded	1,954	2,084	2,651
Related Allowance	131	146	254
Average Recorded Investment with an allowance recorded	1,897	2,177	2,330
Interest Income Recognized with an allowance recorded	93	64	87
Recorded Investment	2,474	2,191	2,720
Unpaid Principal Balance	2,549	2,256	2,813
Average Recorded Investment	2,128	2,405	2,429
Interest Income Recognized with an allowance recorded	$ 94	$ 64	$ 90

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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