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Note 5 - Loans Receivable and Allowance for Loan Losses - Loan Portfolio (Details) - USD ($)
Jun. 30, 2018
May 10, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans receivable, gross $ 757,329,000            
Allowance for loan losses (6,525,000)   $ (6,485,000) $ (6,297,000) $ (5,944,000) $ (5,697,000) $ (4,675,000)
Loans receivable, net 750,804,000     713,350,000      
Business Activities Loans [Member]              
Loans receivable, gross 735,421,000 [1]     719,647,000      
Allowance for loan losses (6,525,000)     (6,297,000)      
Loans receivable, net 728,896,000     713,350,000      
Acquired Loans [Member]              
Loans receivable, gross 21,908,000            
Allowance for loan losses            
Loans receivable, net 21,908,000 $ 21,600,000          
Commercial Real Estate Portfolio Segment [Member]              
Loans receivable, gross 305,426,000            
Allowance for loan losses (2,305,000)   (2,480,000) (2,212,000) (2,218,000) (2,198,000) (1,853,000)
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]              
Loans receivable, gross 292,508,000     299,925,000      
Allowance for loan losses (2,305,000)     (2,212,000)      
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]              
Loans receivable, gross 12,918,000            
Residential Portfolio Segment [Member]              
Loans receivable, gross 146,754,000            
Allowance for loan losses (1,096,000)   (1,073,000) (959,000) (1,041,000) (1,073,000) (534,000)
Residential Portfolio Segment [Member] | Business Activities Loans [Member]              
Loans receivable, gross 146,754,000     146,377,000      
Allowance for loan losses (1,096,000)     (959,000)      
Residential Portfolio Segment [Member] | Acquired Loans [Member]              
Loans receivable, gross            
Commercial Portfolio Segment [Member]              
Loans receivable, gross 170,676,000            
Allowance for loan losses (1,996,000)   (1,759,000) (2,023,000) (1,453,000) (1,049,000) (740,000)
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]              
Loans receivable, gross 162,568,000     131,161,000      
Allowance for loan losses (1,996,000)     (2,023,000)      
Commercial Portfolio Segment [Member] | Acquired Loans [Member]              
Loans receivable, gross 8,108,000            
Consumer Portfolio Segment [Member]              
Loans receivable, gross 79,264,000            
Allowance for loan losses (523,000)   (546,000) (568,000) (593,000) (583,000) (641,000)
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]              
Loans receivable, gross 78,382,000     87,707,000      
Allowance for loan losses (523,000)     (568,000)      
Consumer Portfolio Segment [Member] | Acquired Loans [Member]              
Loans receivable, gross 882,000            
Construction Portfolio Segment [Member]              
Loans receivable, gross 46,593,000            
Allowance for loan losses (499,000)   (488,000) (481,000) (490,000) (591,000) (712,000)
Construction Portfolio Segment [Member] | Business Activities Loans [Member]              
Loans receivable, gross 46,593,000     47,619,000      
Allowance for loan losses (499,000)     (481,000)      
Construction Portfolio Segment [Member] | Acquired Loans [Member]              
Loans receivable, gross            
Construction to Permanent Portfolio Segment [Member]              
Loans receivable, gross 8,616,000            
Allowance for loan losses (80,000)   $ (61,000) (54,000) $ (73,000) $ (77,000) $ (69,000)
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]              
Loans receivable, gross 8,616,000     6,858,000      
Allowance for loan losses (80,000)     $ (54,000)      
Construction to Permanent Portfolio Segment [Member] | Acquired Loans [Member]              
Loans receivable, gross            
[1] The total loan receivable, gross does not include $21.9 million acquired loans which were all individually evaluated for impairment.