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Note 5 - Loans Receivable and Allowance for Loan Losses - Loan Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Allowance for loan losses $ (6,605) $ (6,525) $ (6,297) $ (6,222) $ (5,944) $ (4,675)
Loans receivable, net 756,649   713,350      
Business Activities Loans [Member]            
Loans receivable, gross 763,254 [1]   719,647      
Allowance for loan losses (6,605)   (6,297)      
Loans receivable, net 756,649          
Acquired Loans [Member]            
Loans receivable, gross     719,647      
Allowance for loan losses     (6,297)      
Loans receivable, net     713,350      
Commercial Real Estate Portfolio Segment [Member]            
Allowance for loan losses (1,763) (2,305) (2,212) (2,172) (2,218) (1,853)
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]            
Loans receivable, gross 276,100   299,925      
Allowance for loan losses (1,763)   (2,212)      
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]            
Loans receivable, gross     299,925      
Residential Portfolio Segment [Member]            
Allowance for loan losses (865) (1,096) (959) (1,045) (1,041) (534)
Residential Portfolio Segment [Member] | Business Activities Loans [Member]            
Loans receivable, gross 155,077   146,377      
Allowance for loan losses (865)   (959)      
Residential Portfolio Segment [Member] | Acquired Loans [Member]            
Loans receivable, gross     146,377      
Commercial Portfolio Segment [Member]            
Allowance for loan losses (2,241) (1,996) (2,023) (1,873) (1,453) (740)
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]            
Loans receivable, gross 174,480   131,161      
Allowance for loan losses (2,241)   (2,023)      
Commercial Portfolio Segment [Member] | Acquired Loans [Member]            
Loans receivable, gross     131,161      
Consumer Portfolio Segment [Member]            
Allowance for loan losses (670) (523) (568) (258) (593) (641)
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]            
Loans receivable, gross 97,463   87,707      
Allowance for loan losses (670)   (568)      
Consumer Portfolio Segment [Member] | Acquired Loans [Member]            
Loans receivable, gross     87,707      
Construction Portfolio Segment [Member]            
Allowance for loan losses (680) (499) (481) (783) (490) (712)
Construction Portfolio Segment [Member] | Business Activities Loans [Member]            
Loans receivable, gross 45,476   47,619      
Allowance for loan losses (680)   (481)      
Construction Portfolio Segment [Member] | Acquired Loans [Member]            
Loans receivable, gross     47,619      
Construction to Permanent Portfolio Segment [Member]            
Allowance for loan losses (100) $ (80) (54) $ (46) $ (73) $ (69)
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]            
Loans receivable, gross 14,658   6,858      
Allowance for loan losses $ (100)   (54)      
Construction to Permanent Portfolio Segment [Member] | Acquired Loans [Member]            
Loans receivable, gross     $ 6,858      
[1] The total loan receivable, gross does not include $21.9 million acquired loans which were all individually evaluated for impairment.