Note 2 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring (Details) $ in Thousands	9 Months Ended
Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Total TDRS	$ 1,068		$ 2,676
Number of Contracts	0	1
Pre Modification Outstanding Recorded Investment	$ 0	$ 111
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 132
Commercial Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 0
Agricultural Installment and Other Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 0
Residential 1 to 4 Family [Member] \| Real Estate Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 0
Multifamily Real Estate [Member] \| Real Estate Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 0
Commercial Real Estate [Member] \| Real Estate Portfolio Segment [Member]
Number of Contracts	0	1
Pre Modification Outstanding Recorded Investment	$ 0	$ 111
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 132
Construction Loans [Member] \| Real Estate Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 0
Farmland [Member] \| Real Estate Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 0
Second Mortgages [Member] \| Real Estate Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	$ 0	$ 0
Home Equity Line of Credit [Member] \| Real Estate Portfolio Segment [Member]
Number of Contracts	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, Net of Related Allowance	0	$ 0
Performing Financial Instruments [Member]
Total TDRS	892		2,147
Nonperforming Financial Instruments [Member]
Total TDRS	$ 176		$ 529

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-Publisher FASB
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