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Note 4 - Loans and Allowance for Loan Losses - Recorded Investment of Residential and Consumer Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Loans receivable $ 738,861 $ 734,901
Consumer Portfolio Segment [Member]    
Loans receivable 134,463 134,283
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 62,072 59,772
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 20,966 20,861
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 51,425 53,650
Residential Portfolio Segment [Member]    
Loans receivable 287,161 286,022
Consumer and Residential Portfolio Segment [Member]    
Loans receivable 421,624 420,305
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 61,839 59,646
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 20,948 20,827
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 51,285 53,598
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 283,606 282,445
Performing Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable 417,678 416,516
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 233 126
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 18 34
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 140 52
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 3,555 3,577
Nonperforming Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable $ 3,946 $ 3,789