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Note 4 - Loans, Allowance for Loan Losses and Credit Quality - Allowance for Loan Losses by Portfolio Segment and Impairment Methodology (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Allowance for loan losses, individually evaluated $ 727,000   $ 587,000      
Allowance for loan losses, collectively evaluated 3,982,000   3,633,000      
Allowance for loan losses, ASC 310-30 599,000   587,000      
Allowance for loan losses 5,308,000 $ 5,288,000 4,807,000 $ 4,355,000 $ 4,034,000 $ 3,665,000
Loans, individually evaluated 12,242,000   11,864,000      
Loans, collectively evaluated 595,401,000   568,966,000      
Loans, ASC 310-30 330,643,000   290,972,000      
Loans 938,286,000   871,802,000      
Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses, individually evaluated        
Allowance for loan losses, collectively evaluated        
Allowance for loan losses, ASC 310-30 599,000   587,000      
Allowance for loan losses 599,000 597,000 587,000 520,000 310,000 303,000
Loans, individually evaluated        
Loans, collectively evaluated        
Loans, ASC 310-30 330,643,000   290,972,000      
Loans 330,643,000   290,972,000      
Residential Portfolio Segment [Member]            
Loans 92,566,000   100,128,000      
Residential Portfolio Segment [Member] | Financial Asset Originated with SBA Loans Broken Out Separately from Other Originated Loans [Member]            
Allowance for loan losses, individually evaluated 260,000   322,000      
Allowance for loan losses, collectively evaluated 325,000   283,000      
Allowance for loan losses, ASC 310-30        
Allowance for loan losses 585,000   605,000      
Loans, individually evaluated 4,856,000   5,682,000      
Loans, collectively evaluated 71,116,000   80,520,000      
Loans, ASC 310-30        
Loans 75,972,000   86,202,000      
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Loans 16,594,000   13,926,000      
Commercial Real Estate Portfolio Segment [Member]            
Loans 572,712,000   525,479,000      
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Originated with SBA Loans Broken Out Separately from Other Originated Loans [Member]            
Allowance for loan losses, individually evaluated 148,000   139,000      
Allowance for loan losses, collectively evaluated 1,403,000   1,388,000      
Allowance for loan losses, ASC 310-30        
Allowance for loan losses 1,551,000   1,527,000      
Loans, individually evaluated 3,434,000   2,687,000      
Loans, collectively evaluated 256,017,000   246,741,000      
Loans, ASC 310-30        
Loans 259,451,000   249,428,000      
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Loans 313,261,000   276,051,000      
Commercial Portfolio Segment [Member]            
Loans 202,938,000   182,795,000      
Commercial Portfolio Segment [Member] | Financial Asset Originated with SBA Loans Broken Out Separately from Other Originated Loans [Member]            
Allowance for loan losses, individually evaluated 2,000   8,000      
Allowance for loan losses, collectively evaluated 872,000   612,000      
Allowance for loan losses, ASC 310-30        
Allowance for loan losses 874,000   620,000      
Loans, individually evaluated 40,000   33,000      
Loans, collectively evaluated 202,110,000   181,767,000      
Loans, ASC 310-30        
Loans 202,150,000   181,800,000      
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Loans 788,000   995,000      
Consumer Portfolio Segment [Member]            
Loans 2,788,000   3,244,000      
Consumer Portfolio Segment [Member] | Financial Asset Originated with SBA Loans Broken Out Separately from Other Originated Loans [Member]            
Allowance for loan losses, individually evaluated 4,000   6,000      
Allowance for loan losses, collectively evaluated 12,000   33,000      
Allowance for loan losses, ASC 310-30        
Allowance for loan losses 16,000   39,000      
Loans, individually evaluated 270,000   292,000      
Loans, collectively evaluated 2,518,000   2,952,000      
Loans, ASC 310-30        
Loans 2,788,000   3,244,000      
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Loans        
Unallocated Financing Receivables [Member]            
Allowance for loan losses, individually evaluated 313,000   112,000      
Allowance for loan losses, collectively evaluated 1,370,000   1,317,000      
Allowance for loan losses, ASC 310-30        
Allowance for loan losses 1,683,000 $ 1,607,000 1,429,000 $ 1,339,000 $ 1,331,000 $ 1,224,000
Loans, individually evaluated 3,642,000   3,170,000      
Loans, collectively evaluated 63,640,000   56,986,000      
Loans, ASC 310-30        
Loans $ 67,282,000   $ 60,156,000