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Note 7 - Foreclosed Real Estate (Details Textual) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Acquired Through Foreclosure $ 3,971,000 $ 4,674,000 $ 4,890,000 $ 78,000
Mortgage Loans in Process of Foreclosure, Amount 588,000 793,000    
Residential Real Estate, Physical Possession Obtained [Member]        
Real Estate Acquired Through Foreclosure $ 443,000 $ 226,000