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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Recorded Investment with no related allowance recorded	$ 2,716		$ 2,716		$ 2,728
Unpaid Principal Balance with no related allowance recorded	3,704		3,704		3,398
Recorded Investment with an allowance recorded	2,373		2,373		3,194
Unpaid Principal Balance with an allowance recorded	2,438		2,438		3,323
Related Allowance	233		233		355
Recorded Investment	5,089		5,089		5,922
Unpaid Principal Balance	6,142		6,142		6,721
Average Recorded Investment with no related allowance recorded	1,558	$ 1,179	2,015	$ 774
Interest Income Recognized with no related allowance recorded	4	1	16	74
Average Recorded Investment with an allowance recorded	3,642	4,831	3,409	4,180
Interest Income Recognized with an allowance recorded	21	62	87	142
Average Recorded Investment	5,200	6,010	5,424	4,954
Interest Income Recognized	25	63	103	216
Agricultural [Member]
Recorded Investment with no related allowance recorded	373		373		545
Unpaid Principal Balance with no related allowance recorded	440		440		545
Recorded Investment with an allowance recorded	0		0		379
Unpaid Principal Balance with an allowance recorded	0		0		439
Related Allowance	0		0		103
Recorded Investment	373		373		924
Unpaid Principal Balance	440		440		984
Average Recorded Investment with no related allowance recorded	376	0	324	46
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	0	389	190	390
Interest Income Recognized with an allowance recorded	0	0	0	0
Average Recorded Investment	376	389	514	436
Interest Income Recognized	0	0	0	0
Commercial and Industrial [Member]
Recorded Investment with no related allowance recorded	284		284		259
Unpaid Principal Balance with no related allowance recorded	395		395		340
Recorded Investment with an allowance recorded	61		61		0
Unpaid Principal Balance with an allowance recorded	64		64		0
Related Allowance	1		1		0
Recorded Investment	345		345		259
Unpaid Principal Balance	459		459		340
Average Recorded Investment with no related allowance recorded	142	129	201	65
Interest Income Recognized with no related allowance recorded	0	0	0	9
Average Recorded Investment with an allowance recorded	191	191	102	107
Interest Income Recognized with an allowance recorded	0	0	0	2
Average Recorded Investment	333	320	303	172
Interest Income Recognized	0	0	0	11
Consumer Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	4		4		0
Unpaid Principal Balance with no related allowance recorded	5		5		0
Recorded Investment with an allowance recorded	15		15		17
Unpaid Principal Balance with an allowance recorded	16		16		18
Related Allowance	1		1		4
Recorded Investment	19		19		18
Unpaid Principal Balance	21		21		18
Average Recorded Investment with no related allowance recorded	2	0	1	0
Interest Income Recognized with no related allowance recorded	0	0	0	0
Average Recorded Investment with an allowance recorded	20	37	18	56
Interest Income Recognized with an allowance recorded	0	1	0	1
Average Recorded Investment	22	37	19	56
Interest Income Recognized	0	1	0	1
Construction Real Estate [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		0
Unpaid Principal Balance with an allowance recorded	0		0		0
Related Allowance	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
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	0	0	0	0
Interest Income Recognized with an allowance recorded	0	0	0	0
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Commercial Real Estate Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	1,859		1,859		1,882
Unpaid Principal Balance with no related allowance recorded	2,664		2,664		2,471
Recorded Investment with an allowance recorded	290		290		406
Unpaid Principal Balance with an allowance recorded	290		290		406
Related Allowance	13		13		13
Recorded Investment	2,149		2,149		2,287
Unpaid Principal Balance	2,954		2,954		2,877
Average Recorded Investment with no related allowance recorded	929	941	1,405	507
Interest Income Recognized with no related allowance recorded	3	0	11	61
Average Recorded Investment with an allowance recorded	1,268	1,693	826	1,117
Interest Income Recognized with an allowance recorded	4	13	16	27
Average Recorded Investment	2,197	2,634	2,231	1,624
Interest Income Recognized	7	13	27	88
Residential Portfolio Segment [Member]
Recorded Investment with no related allowance recorded	196		196		42
Unpaid Principal Balance with no related allowance recorded	200		200		42
Recorded Investment with an allowance recorded	2,007		2,007		2,392
Unpaid Principal Balance with an allowance recorded	2,068		2,068		2,460
Related Allowance	218		218		235
Recorded Investment	2,203		2,203		2,434
Unpaid Principal Balance	2,268		2,268		$ 2,502
Average Recorded Investment with no related allowance recorded	109	109	84	156
Interest Income Recognized with no related allowance recorded	1	1	5	4
Average Recorded Investment with an allowance recorded	2,163	2,521	2,273	2,510
Interest Income Recognized with an allowance recorded	17	48	71	112
Average Recorded Investment	2,272	2,630	2,357	2,666
Interest Income Recognized	$ 18	$ 49	$ 76	$ 116

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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