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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans by Loan Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Recorded Investment with no related allowance recorded	$ 754		$ 754		$ 3,958
Unpaid Principal Balance with no related allowance recorded	851		851		4,969
Recorded Investment with an allowance recorded	5,202		5,202		3,893
Unpaid Principal Balance with an allowance recorded	5,272		5,272		3,986
Related Allowance	483		483		431
Recorded Investment	5,956		5,956		7,851
Unpaid Principal Balance	6,123		6,123		8,955
Average Recorded Investment with no related allowance recorded	1,816	$ 1,558	3,049	$ 2,015
Interest Income Recognized with no related allowance recorded	2	4	86	16
Average Recorded Investment with an allowance recorded	4,574	3,642	4,706	3,409
Interest Income Recognized with an allowance recorded	54	21	129	87
Average Recorded Investment	6,390	5,200	7,755	5,424
Interest Income Recognized	56	25	215	103
Agricultural [Member]
Recorded Investment with no related allowance recorded	341		341		348
Unpaid Principal Balance with no related allowance recorded	434		434		434
Recorded Investment with an allowance recorded	2,710		2,710		0
Unpaid Principal Balance with an allowance recorded	2,709		2,709		0
Related Allowance	124		124		0
Recorded Investment	3,051		3,051		348
Unpaid Principal Balance	3,143		3,143		434
Average Recorded Investment with no related allowance recorded	989	376	669	324
Interest Income Recognized with no related allowance recorded	0	0	52	0
Average Recorded Investment with an allowance recorded	2,119	0	1,766	190
Interest Income Recognized with an allowance recorded	36	0	71	0
Average Recorded Investment	3,108	376	2,435	514
Interest Income Recognized	36	0	123	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	296		296		147
Unpaid Principal Balance with an allowance recorded	312		312		147
Related Allowance	174		174		19
Recorded Investment	296		296		1,663
Unpaid Principal Balance	312		312		1,776
Average Recorded Investment with no related allowance recorded	0	142	745	201
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	240	191	198	102
Interest Income Recognized with an allowance recorded	2	0	3	0
Average Recorded Investment	240	333	943	303
Interest Income Recognized	2	0	3	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	2	0	1
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	0	20	2	18
Interest Income Recognized with an allowance recorded	0	0	0	0
Average Recorded Investment	0	22	2	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	176		176		0
Related Allowance	0		0		0
Recorded Investment	0		0		80
Unpaid Principal Balance	176		176		80
Average Recorded Investment with no related allowance recorded	0	0	20	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	0	0	20	0
Interest Income Recognized	0	0	0	0
Commercial Real Estate Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	242		242		1,852
Unpaid Principal Balance with no related allowance recorded	242		242		2,664
Recorded Investment with an allowance recorded	176		176		1,180
Unpaid Principal Balance with an allowance recorded	0		0		1,180
Related Allowance	8		8		157
Recorded Investment	418		418		3,031
Unpaid Principal Balance	242		242		3,844
Average Recorded Investment with no related allowance recorded	507	929	1,372	1,405
Interest Income Recognized with no related allowance recorded	2	3	34	11
Average Recorded Investment with an allowance recorded	272	1,268	525	826
Interest Income Recognized with an allowance recorded	2	4	8	16
Average Recorded Investment	779	2,197	1,897	2,231
Interest Income Recognized	4	7	42	27
Residential Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	171		171		162
Unpaid Principal Balance with no related allowance recorded	175		175		162
Recorded Investment with an allowance recorded	2,020		2,020		2,558
Unpaid Principal Balance with an allowance recorded	2,075		2,075		2,651
Related Allowance	177		177		254
Recorded Investment	2,191		2,191		2,720
Unpaid Principal Balance	2,250		2,250		$ 2,813
Average Recorded Investment with no related allowance recorded	320	109	243	84
Interest Income Recognized with no related allowance recorded	0	1	0	5
Average Recorded Investment with an allowance recorded	1,943	2,163	2,215	2,273
Interest Income Recognized with an allowance recorded	14	17	47	71
Average Recorded Investment	2,263	2,272	2,458	2,357
Interest Income Recognized	$ 14	$ 18	$ 47	$ 76

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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