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Note 6 - Foreclosed Real Estate (Details Textual) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Real Estate Acquired Through Foreclosure $ 36,000 $ 0 $ 170,000 $ 3,142,000
Mortgage Loans in Process of Foreclosure, Amount 53,000 $ 109,000    
Residential Real Estate, Physical Possession Obtained [Member]        
Real Estate Acquired Through Foreclosure $ 36,000