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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mortgage Loans in Process of Foreclosure, Amount $ 337,000 $ 173,000
Financing Receivable, Modifications, Number of Contracts 5 0
Financing Receivable, Number of Payment Deferrals 750  
Financing Receivable, Deferred Payments $ 148,000,000