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Note 7 - Loans Receivable and Credit Disclosures - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loan and lease receivable other than consumer and residential	$ 919,049	$ 918,967
Pass [Member]
Loan and lease receivable other than consumer and residential	700,894	679,429
Watch [Member]
Loan and lease receivable other than consumer and residential	143,155	163,297
Special Mention [Member]
Loan and lease receivable other than consumer and residential	23,964	23,980
Substandard [Member]
Loan and lease receivable other than consumer and residential	38,057	38,373
Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	12,979	13,888
Construction Real Estate [Member]
Loan and lease receivable other than consumer and residential	53,335	45,497
Construction Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	48,042	39,980
Construction Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	3,773	5,350
Construction Real Estate [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	1,353	0
Construction Real Estate [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	0	0
Construction Real Estate [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	167	167
Commercial Real Estate Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	497,155	496,357
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	352,434	346,591
Commercial Real Estate Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	84,589	88,113
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	22,396	23,753
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	27,579	27,642
Commercial Real Estate Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	10,157	10,258
Agriculture Real Estate [Member]
Loan and lease receivable other than consumer and residential	145,228	151,992
Agriculture Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	112,595	110,925
Agriculture Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	25,420	33,144
Agriculture Real Estate [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	173	175
Agriculture Real Estate [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	5,949	6,084
Agriculture Real Estate [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	1,091	1,664
Commercial Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	127,440	122,535
Commercial Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	109,898	101,858
Commercial Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	13,057	15,897
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	42	52
Commercial Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	3,626	3,788
Commercial Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	817	940
Agriculture [Member]
Loan and lease receivable other than consumer and residential	95,891	102,586
Agriculture [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	77,925	80,075
Agriculture [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	16,316	20,793
Agriculture [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	0	0
Agriculture [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	903	859
Agriculture [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	$ 747	$ 859

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