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Note 3 - Loans and Allowance for Loan Losses - Summary of PCI Loans (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Carrying amount $ 400,000 $ 398,000
Allowance for loan losses 0 2,000
Carrying amount, net of allowance 400,000 396,000
Residential Mortgage Segment [Member] | Residential Loan [Member]    
Carrying amount 353,000 350,000
Residential Mortgage Segment [Member] | Commercial Real Estate Loan [Member]    
Carrying amount $ 47,000 $ 48,000