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Note 7 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Financing receivable, recorded investment, past due		$ 4,173	$ 5,292
Financing receivable, recorded investment, current		1,135,788	1,142,285
Loans receivable		1,139,961	1,147,577
Financing receivable, recorded investment, 90 days past due and still accruing		5	39
Construction Real Estate [Member]
Financing receivable, recorded investment, past due		193	336
Financing receivable, recorded investment, current		53,142	45,161
Loans receivable		53,335	45,497
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due		1,327	1,699
Financing receivable, recorded investment, current		205,666	211,863
Loans receivable		206,993	213,562
Financing receivable, recorded investment, 90 days past due and still accruing		5	6
Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		117	208
Financing receivable, recorded investment, current		497,038	496,149
Loans receivable		497,155	496,357
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		1,214	2,192
Financing receivable, recorded investment, current		144,014	149,800
Loans receivable		145,228	151,992
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		755	286
Financing receivable, recorded investment, current		126,685	122,249
Loans receivable	[1]	127,440	122,535
Financing receivable, recorded investment, 90 days past due and still accruing		0	3
Agriculture [Member]
Financing receivable, recorded investment, past due		540	537
Financing receivable, recorded investment, current		95,351	102,049
Loans receivable		95,891	102,586
Financing receivable, recorded investment, 90 days past due and still accruing		0	30
Consumer and Other [Member]
Financing receivable, recorded investment, past due		27	34
Financing receivable, recorded investment, current		13,892	15,014
Loans receivable		13,919	15,048
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Financing Receivables 30 to 89 Days Past Due [Member]
Financing receivable, recorded investment, past due		2,358	2,798
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due		26	169
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due		1,223	1,523
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		117	152
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		622	574
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		203	283
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		158	79
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		9	18
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, past due		1,815	2,494
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due		167	167
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due		104	176
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		0	56
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		592	1,618
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		552	3
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		382	458
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		$ 18	$ 16
[1] Commercial loan portfolio includes $59.2 million and $50.9 million of Paycheck Protection Program ("PPP") loans as of March 31, 2021 and December 31, 2020, respectively.

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