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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, 2020		Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Past Due Total		$ 6,206	[1]		$ 6,358
Loans Not Past Due		1,072,590			795,690
Total Loans		1,078,796			802,048	$ 406,806
Loan 90 days and accruing		157			0
Agricultural [Member]
Past Due Total	[1]	373			68
Loans Not Past Due		53,130			57,271
Total Loans		53,503			57,339	50,057
Loan 90 days and accruing		0			0
Commercial and Industrial [Member]
Past Due Total	[1]	1,035			816
Loans Not Past Due		305,085			147,267
Total Loans		306,120			148,083	81,531
Loan 90 days and accruing		0			0
Consumer Portfolio Segment [Member]
Past Due Total	[1]	75			151
Loans Not Past Due		34,078			38,703
Total Loans		34,153			38,854	24,408
Loan 90 days and accruing		0			0
Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	3,064			1,882
Loans Not Past Due		460,242			324,497
Total Loans		463,306			326,379	144,306
Loan 90 days and accruing		0			0
Construction Real Estate [Member]
Past Due Total	[1]	663			0
Loans Not Past Due		15,826			13,411
Total Loans		16,489			13,411	11,188
Loan 90 days and accruing		0			0
Residential Portfolio Segment [Member]
Past Due Total	[1]	996			3,441
Loans Not Past Due		204,229			214,541
Total Loans		205,225			217,982	$ 95,316
Loan 90 days and accruing		157			0
Financial Asset, 30 to 59 Days Past Due [Member]
Past Due Total		1,760	[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]	369			542
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	75			121
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	1,164			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]	152			2,466
Financial Asset, 60 to 89 Days Past Due [Member]
Past Due Total		1,288	[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]	16			0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Past Due Total	[1]	663			0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Past Due Total	[1]	609			582
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due Total		3,158	[1]		2,545
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member]
Past Due Total	[1]	373			0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Past Due Total	[1]	666			259
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Past Due Total	[1]	0			11
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Past Due Total	[1]	1,884			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]	$ 235			$ 393
[1] Includes nonaccrual loans.

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