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Note 4 - Loans and Allowance for Loan Losses - Recorded Investment of Residential and Consumer Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Loans receivable $ 777,957 $ 734,901
Consumer Portfolio Segment [Member]    
Loans receivable 141,320 134,283
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 67,999 59,772
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 21,287 20,861
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 52,034 53,650
Residential Portfolio Segment [Member]    
Loans receivable 318,244 286,022
Consumer and Residential Portfolio Segment [Member]    
Loans receivable 459,564 420,305
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 67,834 59,646
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 20,862 20,827
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 51,788 53,598
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 313,476 282,445
Performing Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable 453,960 416,516
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 165 126
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 425 34
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 246 52
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 4,768 3,577
Nonperforming Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable $ 5,604 $ 3,789