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Note 8 - Loans Receivable and Credit Disclosures - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loan and lease receivable other than consumer and residential	$ 941,691	$ 840,545
Pass [Member]
Loan and lease receivable other than consumer and residential	722,605	699,777
Watch [Member]
Loan and lease receivable other than consumer and residential	176,762	100,206
Special Mention [Member]
Loan and lease receivable other than consumer and residential	6,072	4,581
Substandard [Member]
Loan and lease receivable other than consumer and residential	19,567	32,401
Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	16,685	3,580
Construction Real Estate [Member]
Loan and lease receivable other than consumer and residential	51,045	47,895
Construction Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	38,995	41,073
Construction Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	12,050	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	0	0
Commercial Real Estate Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	463,077	435,850
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	352,549	387,274
Commercial Real Estate Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	90,122	29,209
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	5,015	4,581
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	4,255	14,703
Commercial Real Estate Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	11,136	83
Agriculture Real Estate [Member]
Loan and lease receivable other than consumer and residential	160,286	160,771
Agriculture Real Estate [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	115,509	118,692
Agriculture Real Estate [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	33,718	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	8,996	9,215
Agriculture Real Estate [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	2,063	84
Commercial Portfolio Segment [Member]
Loan and lease receivable other than consumer and residential	158,217	84,084
Commercial Portfolio Segment [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	135,955	62,655
Commercial Portfolio Segment [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	16,302	16,147
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loan and lease receivable other than consumer and residential	1,057	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Loan and lease receivable other than consumer and residential	3,128	4,820
Commercial Portfolio Segment [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	1,775	462
Agriculture [Member]
Loan and lease receivable other than consumer and residential	109,066	111,945
Agriculture [Member] | Pass [Member]
Loan and lease receivable other than consumer and residential	79,597	90,083
Agriculture [Member] | Watch [Member]
Loan and lease receivable other than consumer and residential	24,570	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	3,188	3,663
Agriculture [Member] | Substandard Impaired [Member]
Loan and lease receivable other than consumer and residential	$ 1,711	$ 2,951

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