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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans by Loan Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Recorded Investment with no related allowance recorded	$ 4,607		$ 3,958
Unpaid Principal Balance with no related allowance recorded	5,613		4,969
Recorded Investment with an allowance recorded	5,782		3,893
Unpaid Principal Balance with an allowance recorded	5,869		3,986
Related Allowance	338		431
Recorded Investment	10,389		7,851
Unpaid Principal Balance	11,482		8,955
Average Recorded Investment with no related allowance recorded	4,282	$ 2,472
Interest Income Recognized with no related allowance recorded	4	0
Average Recorded Investment with an allowance recorded	4,838	3,176
Interest Income Recognized with an allowance recorded	21	37
Average Recorded Investment	9,120	5,648
Interest Income Recognized	25	37
Agricultural [Member]
Recorded Investment with no related allowance recorded	348		348
Unpaid Principal Balance with no related allowance recorded	434		434
Recorded Investment with an allowance recorded	2,825		0
Unpaid Principal Balance with an allowance recorded	2,825		0
Related Allowance	114		0
Recorded Investment	3,173		348
Unpaid Principal Balance	3,259		434
Average Recorded Investment with no related allowance recorded	348	272
Interest Income Recognized with no related allowance recorded	0	0
Average Recorded Investment with an allowance recorded	1,413	379
Interest Income Recognized with an allowance recorded	0	0
Average Recorded Investment	1,761	651
Interest Income Recognized	0	0
Commercial and Industrial [Member]
Recorded Investment with no related allowance recorded	1,463		1,516
Unpaid Principal Balance with no related allowance recorded	1,574		1,629
Recorded Investment with an allowance recorded	163		147
Unpaid Principal Balance with an allowance recorded	165		147
Related Allowance	2		19
Recorded Investment	1,626		1,663
Unpaid Principal Balance	1,739		1,776
Average Recorded Investment with no related allowance recorded	1,490	259
Interest Income Recognized with no related allowance recorded	0	0
Average Recorded Investment with an allowance recorded	155	7
Interest Income Recognized with an allowance recorded	0	0
Average Recorded Investment	1,645	266
Interest Income Recognized	0	0
Consumer Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	0		0
Unpaid Principal Balance with no related allowance recorded	0		0
Recorded Investment with an allowance recorded	0		8
Unpaid Principal Balance with an allowance recorded	0		8
Related Allowance	0		1
Recorded Investment	0		9
Unpaid Principal Balance	0		8
Average Recorded Investment with no related allowance recorded	0	0
Interest Income Recognized with no related allowance recorded	0	0
Average Recorded Investment with an allowance recorded	4	16
Interest Income Recognized with an allowance recorded	0	0
Average Recorded Investment	4	17
Interest Income Recognized	0	0
Construction Real Estate [Member]
Recorded Investment with no related allowance recorded	0		80
Unpaid Principal Balance with no related allowance recorded	0		80
Recorded Investment with an allowance recorded	0		0
Unpaid Principal Balance with an allowance recorded	0		0
Related Allowance	0		0
Recorded Investment	0		80
Unpaid Principal Balance	0		80
Average Recorded Investment with no related allowance recorded	40	0
Interest Income Recognized with no related allowance recorded	0	0
Average Recorded Investment with an allowance recorded	0	0
Interest Income Recognized with an allowance recorded	0	0
Average Recorded Investment	40	0
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	2,624		1,852
Unpaid Principal Balance with no related allowance recorded	3,429		2,664
Recorded Investment with an allowance recorded	377		1,180
Unpaid Principal Balance with an allowance recorded	384		1,180
Related Allowance	10		157
Recorded Investment	3,001		3,031
Unpaid Principal Balance	3,813		3,844
Average Recorded Investment with no related allowance recorded	2,238	1,882
Interest Income Recognized with no related allowance recorded	3	0
Average Recorded Investment with an allowance recorded	778	391
Interest Income Recognized with an allowance recorded	4	7
Average Recorded Investment	3,016	2,272
Interest Income Recognized	7	7
Residential Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	172		162
Unpaid Principal Balance with no related allowance recorded	176		162
Recorded Investment with an allowance recorded	2,417		2,558
Unpaid Principal Balance with an allowance recorded	2,495		2,651
Related Allowance	212		254
Recorded Investment	2,589		2,720
Unpaid Principal Balance	2,671		$ 2,813
Average Recorded Investment with no related allowance recorded	166	59
Interest Income Recognized with no related allowance recorded	1	0
Average Recorded Investment with an allowance recorded	2,488	2,383
Interest Income Recognized with an allowance recorded	17	30
Average Recorded Investment	2,654	2,442
Interest Income Recognized	$ 18	$ 30

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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