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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
Mar. 31, 2017
Dec. 31, 2016
Loans receivable $ 738,861 $ 734,901
Commercial Real Estate Portfolio Segment [Member]    
Loans receivable 211,574 214,007
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 72,232 77,605
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 89,521 90,532
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans receivable 49,821 45,870
Commercial and Industrial Portfolio Segment [Member]    
Loans receivable 105,663 100,589
Commercial Portfolio Segment [Member]    
Loans receivable 317,237 314,596
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 61,934 66,495
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 82,204 83,103
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans receivable 49,025 45,325
Pass [Member] | Commercial and Industrial Portfolio Segment [Member]    
Loans receivable 98,545 94,091
Pass [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 291,708 289,014
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 1,244 428
Criticized [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 2,339 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 1,274 188
Criticized [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 4,857 2,980
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]    
Loans receivable 9,054 10,682
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]    
Loans receivable 4,978 5,065
Classified [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Loans receivable 796 545
Classified [Member] | Commercial and Industrial Portfolio Segment [Member]    
Loans receivable 5,844 6,310
Classified [Member] | Commercial Portfolio Segment [Member]    
Loans receivable $ 20,672 $ 22,602