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Note 7 - Loans Receivable and Credit Disclosures - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loan and lease receivable other than consumer and residential	$ 901,131	$ 918,967
Pass [Member]
Loan and lease receivable other than consumer and residential	703,947	679,429
Watch [Member]
Loan and lease receivable other than consumer and residential	123,272	163,297
Special Mention [Member]
Loan and lease receivable other than consumer and residential	25,175	23,980
Substandard [Member]
Loan and lease receivable other than consumer and residential	37,035	38,373
Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	11,702	13,888
Construction Real Estate [Member]
Loan and lease receivable other than consumer and residential	46,164	45,497
Construction Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	44,565	39,980
Construction Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	246	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	498,561	496,357
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	360,863	346,591
Commercial Real Estate Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	77,746	88,113
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	22,315	23,753
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	27,484	27,642
Commercial Real Estate Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	10,153	10,258
Agriculture Real Estate [Member]
Loan and lease receivable other than consumer and residential	152,157	151,992
Agriculture Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	123,723	110,925
Agriculture Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	21,918	33,144
Agriculture Real Estate [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	171	175
Agriculture Real Estate [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	5,717	6,084
Agriculture Real Estate [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	628	1,664
Commercial Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	106,016	122,535
Commercial Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	92,810	101,858
Commercial Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	8,520	15,897
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	1,336	52
Commercial Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	3,079	3,788
Commercial Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	271	940
Agriculture [Member]
Loan and lease receivable other than consumer and residential	98,233	102,586
Agriculture [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	81,986	80,075
Agriculture [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	14,842	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	755	859
Agriculture [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	$ 650	$ 859

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