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Note 3 - Loans and Allowance for Loan Losses - Nonaccrual Loan by Loan Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Nonaccrual loans $ 5,081 $ 4,687
Agricultural [Member]    
Nonaccrual loans 373 379
Commercial and Industrial [Member]    
Nonaccrual loans 727 776
Consumer Portfolio Segment [Member]    
Nonaccrual loans 19 16
Commercial Real Estate Portfolio Segment [Member]    
Nonaccrual loans 3,186 2,185
Construction Real Estate [Member]    
Nonaccrual loans 0 0
Residential Portfolio Segment [Member]    
Nonaccrual loans $ 775 $ 1,331