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Note 5 - Loans Receivable and Credit Disclosures - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Impaired financing receivable with no related allowance, recorded investment	$ 3,148	$ 4,044
Impaired financing receivable with no related allowance, unpaid principal balance	3,788	4,920
Loans with no specific reserve recorded, average recorded investment	10,442	2,497
Loans with no specific reserve recorded, interest income recognized	517	164
Impaired financing receivable with related allowance, recorded investment	12,125	744
Impaired financing receivable with related allowance, unpaid principal balance	13,205	755
Impaired financing receivable, related allowance	1,819	209
Loans with an allowance recorded, average recorded investment	3,970	1,831
Loans with an allowance recorded, interest income recognized	158	1
Impaired financing receivable, recorded investment	15,273	4,788
Impaired financing receivable, unpaid principal balance	16,993	5,675
Loans, average recorded investment	14,412	4,328
Loans, interest income recognized	675	165
Construction Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	167	0
Impaired financing receivable with no related allowance, unpaid principal balance	167	0
Loans with no specific reserve recorded, average recorded investment	66	0
Loans with no specific reserve recorded, interest income recognized	0	0
Impaired financing receivable with related allowance, recorded investment	0	0
Impaired financing receivable with related allowance, unpaid principal balance	0	0
Impaired financing receivable, related allowance	0	0
Loans with an allowance recorded, average recorded investment	0	0
Loans with an allowance recorded, interest income recognized	0	0
Impaired financing receivable, recorded investment	167	0
Impaired financing receivable, unpaid principal balance	167	0
Loans, average recorded investment	66	0
Loans, interest income recognized	0	0
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable with no related allowance, recorded investment	416	460
Impaired financing receivable with no related allowance, unpaid principal balance	475	796
Loans with no specific reserve recorded, average recorded investment	318	336
Loans with no specific reserve recorded, interest income recognized	0	31
Impaired financing receivable with related allowance, recorded investment	924	744
Impaired financing receivable with related allowance, unpaid principal balance	1,278	755
Impaired financing receivable, related allowance	150	209
Loans with an allowance recorded, average recorded investment	935	329
Loans with an allowance recorded, interest income recognized	66	0
Impaired financing receivable, recorded investment	1,340	1,204
Impaired financing receivable, unpaid principal balance	1,753	1,551
Loans, average recorded investment	1,253	665
Loans, interest income recognized	66	31
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	242	83
Impaired financing receivable with no related allowance, unpaid principal balance	578	435
Loans with no specific reserve recorded, average recorded investment	6,625	323
Loans with no specific reserve recorded, interest income recognized	16	133
Impaired financing receivable with related allowance, recorded investment	10,016	0
Impaired financing receivable with related allowance, unpaid principal balance	10,157	0
Impaired financing receivable, related allowance	1,486	0
Loans with an allowance recorded, average recorded investment	2,198	0
Loans with an allowance recorded, interest income recognized	0	0
Impaired financing receivable, recorded investment	10,258	83
Impaired financing receivable, unpaid principal balance	10,735	435
Loans, average recorded investment	8,823	323
Loans, interest income recognized	16	133
Agriculture Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	1,664	84
Impaired financing receivable with no related allowance, unpaid principal balance	1,698	97
Loans with no specific reserve recorded, average recorded investment	1,295	80
Loans with no specific reserve recorded, interest income recognized	6	0
Impaired financing receivable with related allowance, recorded investment	0	0
Impaired financing receivable with related allowance, unpaid principal balance	0	0
Impaired financing receivable, related allowance	0	0
Loans with an allowance recorded, average recorded investment	0	0
Loans with an allowance recorded, interest income recognized	0	0
Impaired financing receivable, recorded investment	1,664	84
Impaired financing receivable, unpaid principal balance	1,698	97
Loans, average recorded investment	1,295	80
Loans, interest income recognized	6	0
Commercial Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	274	462
Impaired financing receivable with no related allowance, unpaid principal balance	318	517
Loans with no specific reserve recorded, average recorded investment	524	285
Loans with no specific reserve recorded, interest income recognized	23	0
Impaired financing receivable with related allowance, recorded investment	666	0
Impaired financing receivable with related allowance, unpaid principal balance	1,247	0
Impaired financing receivable, related allowance	115	0
Loans with an allowance recorded, average recorded investment	418	1,494
Loans with an allowance recorded, interest income recognized	0	0
Impaired financing receivable, recorded investment	940	462
Impaired financing receivable, unpaid principal balance	1,565	517
Loans, average recorded investment	942	1,779
Loans, interest income recognized	23	0
Agriculture [Member]
Impaired financing receivable with no related allowance, recorded investment	377	2,951
Impaired financing receivable with no related allowance, unpaid principal balance	542	3,071
Loans with no specific reserve recorded, average recorded investment	1,592	1,472
Loans with no specific reserve recorded, interest income recognized	344	0
Impaired financing receivable with related allowance, recorded investment	482	0
Impaired financing receivable with related allowance, unpaid principal balance	484	0
Impaired financing receivable, related allowance	40	0
Loans with an allowance recorded, average recorded investment	400	0
Loans with an allowance recorded, interest income recognized	0	0
Impaired financing receivable, recorded investment	859	2,951
Impaired financing receivable, unpaid principal balance	1,026	3,071
Loans, average recorded investment	1,992	1,472
Loans, interest income recognized	344	0
Consumer and Other [Member]
Impaired financing receivable with no related allowance, recorded investment	8	4
Impaired financing receivable with no related allowance, unpaid principal balance	10	4
Loans with no specific reserve recorded, average recorded investment	22	1
Loans with no specific reserve recorded, interest income recognized	128	0
Impaired financing receivable with related allowance, recorded investment	37	0
Impaired financing receivable with related allowance, unpaid principal balance	39	0
Impaired financing receivable, related allowance	28	0
Loans with an allowance recorded, average recorded investment	19	8
Loans with an allowance recorded, interest income recognized	92	1
Impaired financing receivable, recorded investment	45	4
Impaired financing receivable, unpaid principal balance	49	4
Loans, average recorded investment	41	9
Loans, interest income recognized	$ 220	$ 1

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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