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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 439,000    
Deteriorated Loans Transferred in, Debt Securities, Accreditable Yield, Period Increase (Decrease), Total 25,000    
Payments to Acquire Loans Receivable $ 4,804,000  
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 $ 275,000 $ 81,000  
Maximum Period for Charged Off of Consumer Installment Loans 180 days    
Financing Receivable, Troubled Debt Restructuring $ 10,855,000   $ 2,066,000
Financing Receivable, Modifications, Number of Contracts 6 0 5
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   0  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0   $ 0
Impaired Financing Receivable, Recorded Investment, Total 30,000,000   21,200,000
Impaired Financing Receivable, Related Allowance $ 1,600,000   $ 1,500,000
Number of Impaired Loans 29   25
Non-Accrual Loans [Member]      
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total $ 150,000 $ 0  
Financing Receivable, Troubled Debt Restructuring $ 8,800,000  
Financing Receivable, Modifications, Number of Contracts 1  
Commercial Real Estate Portfolio Segment [Member]      
Maximum Percentage of Credit Extension Based on Market Value of Collateral 75.00%    
Financing Receivable, Troubled Debt Restructuring $ 1,073,000   $ 1,081,000
Financing Receivable, Modifications, Number of Contracts 2   2
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%    
Financing Receivable, Troubled Debt Restructuring $ 8,800,000  
Financing Receivable, Modifications, Number of Contracts 1  
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 8,800,000    
Residential Portfolio Segment [Member]      
Payments to Acquire Loans Receivable 4,800,000 0  
Financing Receivable, Troubled Debt Restructuring $ 292,000   $ 296,000
Financing Receivable, Modifications, Number of Contracts 1   1
Consumer Portfolio Segment [Member]      
Financing Receivable, Troubled Debt Restructuring $ 690,000   $ 689,000
Financing Receivable, Modifications, Number of Contracts 2   2
Consumer Portfolio Segment [Member] | Education Loans [Member]      
Payments to Acquire Loans Receivable $ 0 $ 0  
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 and Industrial Portfolio Segment [Member]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 439,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses $ 0