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Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Recorded investment in loans $ 508,879 $ 473,187
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 131,850 132,539
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 135,484 121,813
Commercial Portfolio Segment [Member]    
Recorded investment in loans 81,809 45,449
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 53,277 55,988
Nonperforming Financial Instruments [Member]    
TDR accruing 1,732 1,166
TDR nonaccrual 0 66
Recorded investment in loans 1,732 1,232
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 556 367
TDR nonaccrual 0 66
Recorded investment in loans 556 433
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR accruing 621 553
TDR nonaccrual 0 0
Recorded investment in loans 621 553
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 210 191
TDR nonaccrual 0 0
Recorded investment in loans 210 191
TDR related allowance for loan losses 0 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR accruing 345 55
TDR nonaccrual 0 0
Recorded investment in loans 345 55
TDR related allowance for loan losses $ 0 $ 0