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Note 5 - Loans Receivable and Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
May 10, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 901,000   $ 901,000    
Deteriorated Loans Transferred in, Debt Securities, Accreditable Yield, Period Increase (Decrease), Total       57,000    
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       $ 37,830,000 $ 73,022,000  
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   85,000 $ 27,000 $ 266,000 $ 70,000  
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   $ 2,900,000   $ 2,900,000   $ 3,000,000
Financing Receivable, Modifications, Number of Contracts   0 0 0 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   0 0 0 0  
Loans and Leases Receivable, Impaired, Commitment to Lend   $ 0   $ 0   0
Impaired Financing Receivable, Recorded Investment, Total   9,300,000   9,300,000   6,800,000
Impaired Financing Receivable, Related Allowance   $ 55,000   $ 55,000   $ 253,000
Number of Impaired Loans   16   16   12
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses   $ 0   $ 0    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Pass [Member]            
Number of Loans, Past Due   5   5    
Financing Receivable, Recorded Investment, Past Due, Total   $ 5,700,000   $ 5,700,000    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Special Mention [Member]            
Number of Loans, Past Due   1   1    
Financing Receivable, Recorded Investment, Past Due, Total   $ 2,400,000   $ 2,400,000    
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 $ 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%    
Construction Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]            
Number of Loans, Past Due   1   1    
Financing Receivable, Recorded Investment, Past Due, Total   $ 8,800,000   $ 8,800,000    
Residential Portfolio Segment [Member]            
Payments to Acquire Loans Receivable       16,400,000   $ 73,000,000
Receivable with Imputed Interest, Premium           $ 985,000
Residential Portfolio Segment [Member] | Multi-family Real Estate [Member] | Substandard [Member]            
Loans and Leases Receivable, Gross, Total   $ 1,500,000   1,500,000    
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