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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, 2019
Dec. 31, 2018
Loans receivable $ 780,644 $ 777,052
Consumer Portfolio Segment [Member]    
Loans receivable 139,992 143,370
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 66,999 70,226
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 23,215 22,512
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 49,778 50,632
Residential Portfolio Segment [Member]    
Loans receivable 302,391 304,079
Consumer and Residential Portfolio Segment [Member]    
Loans receivable 442,383 447,449
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 66,729 69,897
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 22,947 22,238
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 49,585 50,318
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 295,308 297,399
Performing Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable 434,569 439,852
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Loans receivable 270 329
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Loans receivable 268 274
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]    
Loans receivable 193 314
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member]    
Loans receivable 7,083 6,680
Nonperforming Financial Instruments [Member] | Consumer and Residential Portfolio Segment [Member]    
Loans receivable $ 7,814 $ 7,597