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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands		Mar. 31, 2021		Dec. 31, 2020	Mar. 31, 2020
Past Due Total		$ 4,769	[1]	$ 6,490
Loans Not Past Due		1,030,314		1,063,178
Total Loans		1,035,083		1,069,668	$ 811,577
Loan 90 days and accruing		0		0
Agricultural [Member]
Past Due Total	[1]	0		0
Loans Not Past Due		46,686		53,735
Total Loans		46,686		53,735	50,483
Loan 90 days and accruing		0		0
Commercial and Industrial [Member]
Past Due Total	[1]	595		624
Loans Not Past Due		297,455		302,903
Total Loans		298,050		303,527	141,201
Loan 90 days and accruing		0		0
Consumer Portfolio Segment [Member]
Past Due Total	[1]	11		39
Loans Not Past Due		32,319		33,975
Total Loans		32,330		34,014	34,252
Loan 90 days and accruing		0		0
Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	1,850		2,320
Loans Not Past Due		460,571		466,927
Total Loans		462,421		469,247	351,753
Loan 90 days and accruing		0		0
Construction Real Estate [Member]
Past Due Total	[1]	492		1,336
Loans Not Past Due		15,178		15,303
Total Loans		15,670		16,639	17,525
Loan 90 days and accruing		0		0
Residential Portfolio Segment [Member]
Past Due Total	[1]	1,821		2,171
Loans Not Past Due		178,105		190,335
Total Loans		179,926		192,506	$ 216,363
Loan 90 days and accruing		0		0
Financial Asset, 30 to 59 Days Past Due [Member]
Past Due Total		2,611	[1]	3,210
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural [Member]
Past Due Total	[1]	0		0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Past Due Total	[1]	182		0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	11		39
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	184		532
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member]
Past Due Total	[1]	492		1,076
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Past Due Total	[1]	1,742		1,563
Financial Asset, 60 to 89 Days Past Due [Member]
Past Due Total		0	[1]	589
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member]
Past Due Total	[1]	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Past Due Total	[1]	0		109
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	0		44
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Past Due Total	[1]	0		180
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Past Due Total	[1]	0		256
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due Total		2,158	[1]	2,691
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member]
Past Due Total	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Past Due Total	[1]	413		515
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	1,666		1,744
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Past Due Total	[1]	0		80
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Past Due Total	[1]	$ 79		$ 352
[1] Includes nonaccrual loans.

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