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Note 6 - Allowance for Loan Losses and Impaired Loans - Troubled Debt Restructuring (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of contracts 3 3
Premodification $ 164 $ 85
Postmodification $ 176 $ 99
Number of contracts, subsequently defaulted [1] 0
Premodification, subsequently defaulted [1]
Postmodification, subsequently defaulted [1]
Construction and Development Loan [Member]    
Number of contracts 1
Premodification $ 9
Postmodification $ 11
Number of contracts, subsequently defaulted [1]
Premodification, subsequently defaulted [1]
Postmodification, subsequently defaulted [1]
Farmland Loan [Member]    
Number of contracts 1
Premodification $ 38
Postmodification $ 37
Number of contracts, subsequently defaulted [1]
Premodification, subsequently defaulted [1]
Postmodification, subsequently defaulted [1]
Residential Loan [Member]    
Number of contracts 1 2
Premodification $ 117 $ 80
Postmodification $ 128 $ 95
Number of contracts, subsequently defaulted [1]
Premodification, subsequently defaulted [1]
Postmodification, subsequently defaulted [1]
Commercial Mortgage Loan [Member]    
Number of contracts
Premodification
Postmodification
Number of contracts, subsequently defaulted [1]
Premodification, subsequently defaulted [1]
Postmodification, subsequently defaulted [1]
Commercial and Agricultural Loan [Member]    
Number of contracts
Premodification
Postmodification
Number of contracts, subsequently defaulted [1]
Premodification, subsequently defaulted [1]
Postmodification, subsequently defaulted [1]
Consumer and Other Loan [Member]    
Number of contracts 1
Premodification $ 5
Postmodification $ 4
Number of contracts, subsequently defaulted [1]
Premodification, subsequently defaulted [1]
Postmodification, subsequently defaulted [1]
[1] Loans past due 30 days or more are considered to be in default.