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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands		Jun. 30, 2021		Dec. 31, 2020	Jun. 30, 2020
Loans		$ 1,004,587		$ 1,069,668	$ 907,993
Loan 90 days and accruing		0		0
Agricultural [Member]
Loans		46,567		53,735	50,935
Loan 90 days and accruing		0		0
Commercial and Industrial [Member]
Loans		265,032		303,527	242,012
Loan 90 days and accruing		0		0
Consumer Portfolio Segment [Member]
Loans		33,370		34,014	33,769
Loan 90 days and accruing		0		0
Commercial Real Estate Portfolio Segment [Member]
Loans		473,987		469,247	363,063
Loan 90 days and accruing		0		0
Construction Real Estate [Member]
Loans		15,440		16,639	15,576
Loan 90 days and accruing		0		0
Residential Portfolio Segment [Member]
Loans		170,191		192,506	$ 202,638
Loan 90 days and accruing		0		0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans		818	[1]	3,210
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	281		0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	15		39
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	425		532
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		1,076
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	97		1,563
Financial Asset, 60 to 89 Days Past Due [Member]
Loans		139	[1]	589
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	21		109
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	0		44
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		180
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	118		256
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans		981	[1]	2,691
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	317		515
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	184		1,744
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		80
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	480		352
Financial Asset, Past Due [Member]
Loans		1,938	[1]	6,490
Financial Asset, Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	619		624
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	15		39
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	609		2,320
Financial Asset, Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		1,336
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	695		2,171
Financial Asset, Not Past Due [Member]
Loans		1,002,649		1,063,178
Financial Asset, Not Past Due [Member] | Agricultural [Member]
Loans		46,567		53,735
Financial Asset, Not Past Due [Member] | Commercial and Industrial [Member]
Loans		264,413		302,903
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans		33,355		33,975
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans		473,378		466,927
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans		15,440		15,303
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]
Loans		$ 169,496		$ 190,335
[1] Includes nonaccrual loans.

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Amount of financing receivable 90 days or more past due and still accruing.

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- Definition

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