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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans by Loan Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Recorded Investment with no related allowance recorded	$ 2,878		$ 2,878		$ 3,958
Unpaid Principal Balance with no related allowance recorded	2,889		2,889		4,969
Recorded Investment with an allowance recorded	3,946		3,946		3,893
Unpaid Principal Balance with an allowance recorded	4,205		4,205		3,986
Related Allowance	362		362		431
Recorded Investment	6,824		6,824		7,851
Unpaid Principal Balance	7,094		7,094		8,955
Average Recorded Investment with no related allowance recorded	3,814	$ 1,309	3,742	$ 1,782
Interest Income Recognized with no related allowance recorded	37	0	84	0
Average Recorded Investment with an allowance recorded	4,541	4,027	4,864	3,749
Interest Income Recognized with an allowance recorded	34	27	75	64
Average Recorded Investment	8,355	5,336	8,606	5,531
Interest Income Recognized	71	27	159	64
Agricultural [Member]
Recorded Investment with no related allowance recorded	1,637		1,637		348
Unpaid Principal Balance with no related allowance recorded	1,637		1,637		434
Recorded Investment with an allowance recorded	1,530		1,530		0
Unpaid Principal Balance with an allowance recorded	1,615		1,615		0
Related Allowance	138		138		0
Recorded Investment	3,167		3,167		348
Unpaid Principal Balance	3,252		3,252		434
Average Recorded Investment with no related allowance recorded	778	190	993	308
Interest Income Recognized with no related allowance recorded	24	0	52	0
Average Recorded Investment with an allowance recorded	1,451	190	2,177	253
Interest Income Recognized with an allowance recorded	16	0	35	0
Average Recorded Investment	2,229	380	3,170	561
Interest Income Recognized	40	0	87	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
Recorded Investment with an allowance recorded	184		184		147
Unpaid Principal Balance with an allowance recorded	313		313		147
Related Allowance	20		20		19
Recorded Investment	184		184		1,663
Unpaid Principal Balance	313		313		1,776
Average Recorded Investment with no related allowance recorded	993	129	731	173
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	165	167	174	116
Interest Income Recognized with an allowance recorded	0	0	1	0
Average Recorded Investment	1,158	296	905	289
Interest Income Recognized	0	0	1	0
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
Recorded Investment with an allowance recorded	0		0		8
Unpaid Principal Balance with an allowance recorded	0		0		8
Related Allowance	0		0		1
Recorded Investment	0		0		9
Unpaid Principal Balance	0		0		8
Average Recorded Investment with no related allowance recorded	0	0	0	0
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	3	19	0	19
Interest Income Recognized with an allowance recorded	0	0	0	0
Average Recorded Investment	3	19	0	19
Interest Income Recognized	0	0	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
Recorded Investment with an allowance recorded	0		0		0
Unpaid Principal Balance with an allowance recorded	0		0		0
Related Allowance	0		0		0
Recorded Investment	0		0		80
Unpaid Principal Balance	0		0		80
Average Recorded Investment with no related allowance recorded	27	0	0	0
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	0	0	0	0
Interest Income Recognized with an allowance recorded	0	0	0	0
Average Recorded Investment	27	0	0	0
Interest Income Recognized	0	0	0	0
Commercial Real Estate Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	772		772		1,852
Unpaid Principal Balance with no related allowance recorded	772		772		2,664
Recorded Investment with an allowance recorded	368		368		1,180
Unpaid Principal Balance with an allowance recorded	376		376		1,180
Related Allowance	56		56		157
Recorded Investment	1,140		1,140		3,031
Unpaid Principal Balance	1,148		1,148		3,844
Average Recorded Investment with no related allowance recorded	1,749	941	1,698	1,255
Interest Income Recognized with no related allowance recorded	13	0	32	0
Average Recorded Investment with an allowance recorded	642	1,312	372	1,005
Interest Income Recognized with an allowance recorded	3	5	6	12
Average Recorded Investment	2,391	2,253	2,070	2,260
Interest Income Recognized	16	5	38	12
Residential Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	469		469		162
Unpaid Principal Balance with no related allowance recorded	480		480		162
Recorded Investment with an allowance recorded	1,864		1,864		2,558
Unpaid Principal Balance with an allowance recorded	1,901		1,901		2,651
Related Allowance	148		148		254
Recorded Investment	2,333		2,333		2,720
Unpaid Principal Balance	2,381		2,381		$ 2,813
Average Recorded Investment with no related allowance recorded	267	49	320	46
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	2,280	2,339	2,141	2,356
Interest Income Recognized with an allowance recorded	15	22	33	52
Average Recorded Investment	2,547	2,388	2,461	2,402
Interest Income Recognized	$ 15	$ 22	$ 33	$ 52

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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