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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Recorded investment in loans $ 472,125 $ 473,187
Loans 472,125 473,187
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 128,608 132,539
Loans 128,608 132,539
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 129,456 121,813
Loans 129,456 121,813
Commercial Portfolio Segment [Member]    
Recorded investment in loans 44,928 45,449
Loans 44,928 45,449
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 55,938 55,988
Loans 55,938 55,988
Nonperforming Financial Instruments [Member]    
TDR accruing 1,265 1,166
TDR nonaccrual 65 66
Recorded investment in loans 1,330 1,232
TDR related allowance for loan losses
Loans 1,330 1,232
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 381 367
TDR nonaccrual 65 66
Recorded investment in loans 446 433
TDR related allowance for loan losses
Loans 446 433
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR accruing 643 553
TDR nonaccrual
Recorded investment in loans 643 553
TDR related allowance for loan losses
Loans 643 553
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 186 191
TDR nonaccrual
Recorded investment in loans 186 191
TDR related allowance for loan losses
Loans 186 191
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR accruing 55 55
TDR nonaccrual
Recorded investment in loans 55 55
TDR related allowance for loan losses
Loans $ 55 $ 55