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Note 8 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Financing receivable, recorded investment, past due		$ 6,309	$ 7,866
Financing receivable, recorded investment, current		1,170,790	1,052,980
Loans receivable		1,177,099	1,060,846
Financing receivable, recorded investment, 90 days past due and still accruing		180	255
Construction Real Estate [Member]
Financing receivable, recorded investment, past due		191	1,796
Financing receivable, recorded investment, current		45,330	46,099
Loans receivable		45,521	47,895
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		1,148	1,101
Financing receivable, recorded investment, current		210,091	200,409
Loans receivable		211,239	201,510
Financing receivable, recorded investment, 90 days past due and still accruing		131	188
Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		251	387
Financing receivable, recorded investment, current		491,148	435,463
Loans receivable		491,399	435,850
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		2,849	422
Financing receivable, recorded investment, current		154,646	160,349
Loans receivable		157,495	160,771
Financing receivable, recorded investment, 90 days past due and still accruing		33	0
Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		751	755
Financing receivable, recorded investment, current		151,956	83,329
Loans receivable	[1]	152,707	84,084
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture [Member]
Financing receivable, recorded investment, past due		1,046	3,253
Financing receivable, recorded investment, current		101,153	108,692
Loans receivable		102,199	111,945
Financing receivable, recorded investment, 90 days past due and still accruing		0	62
Consumer and Other [Member]
Financing receivable, recorded investment, past due		73	152
Financing receivable, recorded investment, current		16,466	18,639
Loans receivable		16,539	18,791
Financing receivable, recorded investment, 90 days past due and still accruing		16	5
Financing Receivables 30 to 89 Days Past Due [Member]
Financing receivable, recorded investment, past due		2,694	4,746
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due		26	1,796
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due		763	811
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		176	387
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		1,014	422
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		104	518
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		574	666
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		37	146
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, past due		3,615	3,120
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due		165	0
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		385	290
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		75	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		1,835	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		647	237
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		472	2,587
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		$ 36	$ 6
[1] Commercial loan portfolio as of September 30, 2020 includes $79.6 million Payroll Protection Program ("PPP") loans

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