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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands		Sep. 30, 2021		Dec. 31, 2020	Sep. 30, 2020
Loans		$ 988,357		$ 1,069,668	$ 1,078,796
Loan 90 days and accruing		0		0
Agricultural [Member]
Loans		63,445		53,735	53,503
Loan 90 days and accruing		0		0
Commercial and Industrial [Member]
Loans		217,242		303,527	306,120
Loan 90 days and accruing		0		0
Consumer Portfolio Segment [Member]
Loans		33,806		34,014	34,153
Loan 90 days and accruing		0		0
Commercial Real Estate Portfolio Segment [Member]
Loans		485,332		469,247	463,306
Loan 90 days and accruing		0		0
Construction Real Estate [Member]
Loans		18,238		16,639	16,489
Loan 90 days and accruing		0		0
Residential Portfolio Segment [Member]
Loans		170,294		192,506	$ 205,225
Loan 90 days and accruing		0		0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans		194	[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]	83		0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	5		39
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	94		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]	12		1,563
Financial Asset, 60 to 89 Days Past Due [Member]
Loans		581	[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]	305		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]	276		256
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans		721	[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]	296		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]	243		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]	182		352
Financial Asset, Past Due [Member]
Loans		1,496	[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]	684		624
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	5		39
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	337		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]	470		2,171
Financial Asset, Not Past Due [Member]
Loans		986,861		1,063,178
Financial Asset, Not Past Due [Member] | Agricultural [Member]
Loans		63,445		53,735
Financial Asset, Not Past Due [Member] | Commercial and Industrial [Member]
Loans		216,558		302,903
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans		33,801		33,975
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans		484,995		466,927
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans		18,238		15,303
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]
Loans		$ 169,824		$ 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

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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