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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Recorded investment in loans $ 455,682 $ 439,855
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 142,111 137,019
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 106,992 107,672
Commercial Portfolio Segment [Member]    
Recorded investment in loans 40,176 36,417
Nonperforming Financial Instruments [Member]    
TDR accruing 552 703
TDR nonaccrual 659 673
Recorded investment in loans 1,211 1,376
TDR related allowance for loan losses 39 44
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 146 295
TDR nonaccrual 297 302
Recorded investment in loans 443 597
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR accruing 190 190
TDR nonaccrual 362 371
Recorded investment in loans 552 561
TDR related allowance for loan losses 39 44
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
TDR accruing 216 218
TDR nonaccrual
Recorded investment in loans 216 218
TDR related allowance for loan losses