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Note 4 - Loans and Allowance for Loan Losses - Risk Category of Commercial Loans by Class of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Loans receivable $ 777,957 $ 734,901
Commercial Real Estate Portfolio Segment [Member]    
Loans receivable 214,843 214,007
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 72,525 77,605
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 99,966 90,532
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans receivable 42,352 45,870
Commercial and Industrial Portfolio Segment [Member]    
Loans receivable 103,550 100,589
Commercial Portfolio Segment [Member]    
Loans receivable 318,393 314,596
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 63,913 66,495
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 93,831 83,103
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans receivable 41,936 45,325
Pass [Member] | Commercial and Industrial Portfolio Segment [Member]    
Loans receivable 96,614 94,091
Pass [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 296,294 289,014
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 955 428
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 2,223 2,364
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans receivable
Criticized [Member] | Commercial and Industrial Portfolio Segment [Member]    
Loans receivable 1,350 188
Criticized [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 4,528 2,980
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 7,657 10,682
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 3,912 5,065
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans receivable 416 545
Classified [Member] | Commercial and Industrial Portfolio Segment [Member]    
Loans receivable 5,586 6,310
Classified [Member] | Commercial Portfolio Segment [Member]    
Loans receivable $ 17,571 $ 22,602