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Note 7 - Loans Receivable and Credit Disclosures - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loan and lease receivable other than consumer and residential	$ 896,491	$ 918,967
Pass [Member]
Loan and lease receivable other than consumer and residential	699,831	679,429
Watch [Member]
Loan and lease receivable other than consumer and residential	123,351	163,297
Special Mention [Member]
Loan and lease receivable other than consumer and residential	27,577	23,980
Substandard [Member]
Loan and lease receivable other than consumer and residential	34,269	38,373
Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	11,463	13,888
Construction Real Estate [Member]
Loan and lease receivable other than consumer and residential	37,476	45,497
Construction Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	35,797	39,980
Construction Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	326	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	0	167
Commercial Real Estate Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	519,112	496,357
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	381,055	346,591
Commercial Real Estate Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	79,194	88,113
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	24,687	23,753
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	24,222	27,642
Commercial Real Estate Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	9,954	10,258
Agriculture Real Estate [Member]
Loan and lease receivable other than consumer and residential	153,247	151,992
Agriculture Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	125,868	110,925
Agriculture Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	21,037	33,144
Agriculture Real Estate [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	167	175
Agriculture Real Estate [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	5,599	6,084
Agriculture Real Estate [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	576	1,664
Commercial Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	85,569	122,535
Commercial Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	72,151	101,858
Commercial Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	8,077	15,897
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	1,370	52
Commercial Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	3,676	3,788
Commercial Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	295	940
Agriculture [Member]
Loan and lease receivable other than consumer and residential	101,087	102,586
Agriculture [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	84,960	80,075
Agriculture [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	14,717	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	772	859
Agriculture [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	$ 638	$ 859

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