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Note 5 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Financing receivable, recorded investment, past due		$ 5,292	$ 7,866
Financing receivable, recorded investment, current		1,142,285	1,052,980
Loans receivable		1,147,577	1,060,846
Financing receivable, recorded investment, 90 days past due and still accruing		39	255
Construction Real Estate [Member]
Financing receivable, recorded investment, past due		336	1,796
Financing receivable, recorded investment, current		45,161	46,099
Loans receivable		45,497	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		1,699	1,101
Financing receivable, recorded investment, current		211,863	200,409
Loans receivable		213,562	201,510
Financing receivable, recorded investment, 90 days past due and still accruing		6	188
Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		208	387
Financing receivable, recorded investment, current		496,149	435,463
Loans receivable		496,357	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		2,192	422
Financing receivable, recorded investment, current		149,800	160,349
Loans receivable		151,992	160,771
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		286	755
Financing receivable, recorded investment, current		122,249	83,329
Loans receivable	[1]	122,535	84,084
Financing receivable, recorded investment, 90 days past due and still accruing		3	0
Agriculture [Member]
Financing receivable, recorded investment, past due		537	3,253
Financing receivable, recorded investment, current		102,049	108,692
Loans receivable		102,586	111,945
Financing receivable, recorded investment, 90 days past due and still accruing		30	62
Consumer and Other [Member]
Financing receivable, recorded investment, past due		34	152
Financing receivable, recorded investment, current		15,014	18,639
Loans receivable		15,048	18,791
Financing receivable, recorded investment, 90 days past due and still accruing		0	5
Financing Receivables 30 to 89 Days Past Due [Member]
Financing receivable, recorded investment, past due		2,798	4,746
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due		169	1,796
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due		1,523	811
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		152	387
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		574	422
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		283	518
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		79	666
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		18	146
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, past due		2,494	3,120
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due		167	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		176	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		56	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		1,618	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		3	237
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		458	2,587
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		$ 16	$ 6
[1] Commercial loan portfolio as of December 31, 2020 includes $50.9 million Paycheck Protection Program ("PPP") loans

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