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Note 8 - Loans Receivable and Credit Disclosures - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loan and lease receivable other than consumer and residential	$ 949,321	$ 840,545
Pass [Member]
Loan and lease receivable other than consumer and residential	742,316	699,777
Watch [Member]
Loan and lease receivable other than consumer and residential	153,381	100,206
Special Mention [Member]
Loan and lease receivable other than consumer and residential	3,200	4,581
Substandard [Member]
Loan and lease receivable other than consumer and residential	35,419	32,401
Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	15,005	3,580
Construction Real Estate [Member]
Loan and lease receivable other than consumer and residential	45,521	47,895
Construction Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	39,626	41,073
Construction Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	5,730	6,822
Construction Real Estate [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	0	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	165	0
Commercial Real Estate Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	491,399	435,850
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	380,297	387,274
Commercial Real Estate Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	74,178	29,209
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	3,200	4,581
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	22,678	14,703
Commercial Real Estate Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	11,046	83
Agriculture Real Estate [Member]
Loan and lease receivable other than consumer and residential	157,495	160,771
Agriculture Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	113,790	118,692
Agriculture Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	34,810	32,780
Agriculture Real Estate [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	0	0
Agriculture Real Estate [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	7,027	9,215
Agriculture Real Estate [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	1,868	84
Commercial Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	152,707	84,084
Commercial Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	132,487	62,655
Commercial Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	14,820	16,147
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	0	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	4,451	4,820
Commercial Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	949	462
Agriculture [Member]
Loan and lease receivable other than consumer and residential	102,199	111,945
Agriculture [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	76,116	90,083
Agriculture [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	23,843	15,248
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	1,263	3,663
Agriculture [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	$ 977	$ 2,951

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