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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, 2018
Dec. 31, 2017
Loans receivable $ 782,377 $ 769,319
Consumer Portfolio Segment [Member]    
Loans receivable 142,029 139,621
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 70,137 68,626
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 22,419 21,431
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 49,473 49,564
Residential Portfolio Segment [Member]    
Loans receivable 305,314 309,163
Consumer and Residential Portfolio Segment [Member]    
Loans receivable 447,343 448,784
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 69,845 68,413
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 22,070 21,148
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 49,033 49,362
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 298,218 303,126
Performing Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable 439,166 442,049
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 292 213
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 349 283
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 440 202
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 7,096 6,037
Nonperforming Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable $ 8,177 $ 6,735