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Note 5 - Loans and Allowance for Loan Losses - Summary of PCI Loans (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Carrying amount $ 398,000 $ 630,000
Allowance for loan losses 2,000 0
396,000 630,000
Residential Mortgage Segment [Member] | Residential Loan [Member]    
Carrying amount 350,000 390,000
Residential Mortgage Segment [Member] | Commercial Real Estate Loan [Member]    
Carrying amount $ 48,000 $ 240,000