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Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Recorded investment in loans $ 473,187 $ 439,855
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 132,539 137,019
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 121,813 107,672
Commercial Portfolio Segment [Member]    
Recorded investment in loans 45,449 36,417
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 55,988 53,003
Nonperforming Financial Instruments [Member]    
TDR accruing 1,166 703
TDR nonaccrual 66 673
Recorded investment in loans 1,232 1,376
TDR related allowance for loan losses 44
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 367 295
TDR nonaccrual 66 302
Recorded investment in loans 433 597
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR accruing 553 190
TDR nonaccrual 371
Recorded investment in loans 553 561
TDR related allowance for loan losses 44
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 191 218
TDR nonaccrual
Recorded investment in loans 191 218
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR accruing 55
TDR nonaccrual
Recorded investment in loans 55
TDR related allowance for loan losses