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Note 3 - Loans and Allowance for Loan Losses - Summary of PCI Loans (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Carrying amount $ 318,000 $ 324,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses 23,000 12,000 $ 11,000
Carrying amount, net of allowance 295,000 312,000  
Residential Mortgage Segment [Member] | Residential Loan [Member]      
Carrying amount 281,000 285,000  
Residential Mortgage Segment [Member] | Commercial Real Estate Loan [Member]      
Carrying amount $ 37,000 $ 39,000