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Note 5 - Loans Receivable and Allowance for Loan and Lease Losses (Details Textual)
1 Months Ended 12 Months Ended
May 10, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net     $ 615,000    
Deteriorated Loans Transferred in, Debt Securities, Accreditable Yield, Period Increase (Decrease), Total     92,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition $ 3,752,000        
Payments to Acquire Loans Receivable     $ 47,074,000 $ 73,022,000 $ 52,005,000
Maximum Period of Credit Extension of Construction Loans     1 year 180 days    
Loans Receivable, Term to Reset to FHLB Rate     5 years    
Period for Charged Off of Open-End Credits     180 days    
Period for Charged Off of Close-End Credits     120 days    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans     $ 503,000 209,000 $ 79,000
Threshold Period Past Due for Write-off of Financing Receivable     90 days    
Maximum Period for Charged Off of Consumer Installment Loans     180 days    
Financing Receivable, Modifications, Recorded Investment     $ 2,100,000 $ 3,000,000  
Financing Receivable, Modifications, Number of Contracts     0 0 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0 0 0
Loans and Leases Receivable, Impaired, Commitment to Lend     $ 0 $ 0  
Impaired Financing Receivable, Recorded Investment, Total     21,200,000 6,800,000  
Impaired Financing Receivable, Related Allowance     $ 1,500,000 $ 253,000  
Number of Impaired Loans     25 12  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses     $ 0    
Revised Acquisition Date Estimate [Member]          
Deteriorated Loans Transferred in, Debt Securities, Accreditable Yield, Period Increase (Decrease), Total 887,000        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition $ 887,000        
Non-Accrual Loans [Member]          
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total     $ 0 $ 0 $ 0
Commercial Real Estate Portfolio Segment [Member]          
Maximum Percentage of Credit Extension Based on Market Value of Collateral     75.00%    
Multi-family Real Estate [Member]          
Maximum Percentage of Credit Extension Based on Market Value of Collateral     80.00%    
Construction Portfolio Segment [Member]          
Percentage of Maximum Loan to Value     75.00%    
Residential Portfolio Segment [Member]          
Payments to Acquire Loans Receivable     $ 25,600,000 $ 73,000,000  
Consumer Portfolio Segment [Member] | Education Loans [Member]          
Payments to Acquire Loans Receivable     $ 21,400,000    
Construction to Permanent Portfolio Segment [Member] | Minimum [Member]          
Loans Receivable, Term     20 years    
Construction to Permanent Portfolio Segment [Member] | Maximum [Member]          
Loans Receivable, Term     25 years    
Commercial Portfolio Segment [Member]          
Proceeds from Insurance Settlement, Investing Activities   $ 2,800,000