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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, 2020		Dec. 31, 2019	Jun. 30, 2019
Past Due Total		$ 5,982	[1]	$ 6,358
Loans Not Past Due		902,011		795,690
Total Loans		907,993		802,048	$ 397,227
Loan 90 days and accruing		0		0
Agricultural [Member]
Past Due Total	[1]	379		68
Loans Not Past Due		50,556		57,271
Total Loans		50,935		57,339	40,881
Loan 90 days and accruing		0		0
Commercial and Industrial [Member]
Past Due Total	[1]	783		816
Loans Not Past Due		241,229		147,267
Total Loans		242,012		148,083	85,082
Loan 90 days and accruing		0		0
Consumer Portfolio Segment [Member]
Past Due Total	[1]	15		151
Loans Not Past Due		33,754		38,703
Total Loans		33,769		38,854	24,682
Loan 90 days and accruing		0		0
Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	4,066		1,882
Loans Not Past Due		358,997		324,497
Total Loans		363,063		326,379	140,942
Loan 90 days and accruing		0		0
Construction Real Estate [Member]
Past Due Total	[1]	0		0
Loans Not Past Due		15,576		13,411
Total Loans		15,576		13,411	9,948
Loan 90 days and accruing		0		0
Residential Portfolio Segment [Member]
Past Due Total	[1]	739		3,441
Loans Not Past Due		201,899		214,541
Total Loans		202,638		217,982	$ 95,692
Loan 90 days and accruing		0		0
Financial Asset, 30 to 59 Days Past Due [Member]
Past Due Total		2,309	[1]	3,129
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]	103		542
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	5		121
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	1,955		0
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member]
Past Due Total	[1]	0		0
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Past Due Total	[1]	246		2,466
Financial Asset, 60 to 89 Days Past Due [Member]
Past Due Total		420	[1]	684
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member]
Past Due Total	[1]	0		68
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Past Due Total	[1]	0		15
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	0		19
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	8		0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Past Due Total	[1]	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Past Due Total	[1]	412		582
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due Total		3,253	[1]	2,545
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member]
Past Due Total	[1]	379		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Past Due Total	[1]	680		259
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	10		11
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	2,103		1,882
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Past Due Total	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Past Due Total	[1]	$ 81		$ 393
[1] Includes nonaccrual loans.

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