Note 5 - Loans (Details Textual)
11 Months Ended 12 Months Ended
Dec. 13, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Gain (Loss) on Sales of Loans, Net   $ 340,000 $ 292,000 $ 292,000
Education Loans Recorded Investment       2,600,000
Net Loss on Sale of Student Loans   13,000
Impaired Financing Receivable, Minimum Outstanding Balance Threshold   100,000    
Loans and Leases Receivable, Allowance   8,419,000 8,790,000  
Financing Receivable, Recorded Investment, Nonaccrual Status   $ 2,200,000 3,800,000  
Loans Still Classified as Non-accrual Status, Period of Past Due   90 days    
Financing Receivable, Collectively Evaluated for Impairment   $ 726,154,000 723,191,000 659,698,000
Impaired Financing Receivable, Recorded Investment   5,604,000 7,961,000  
Impaired Financing Receivable, Related Allowance   302,000 381,000  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   200,000 400,000 400,000
Financing Receivable, Modifications, Recorded Investment   4,300,000 5,800,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   306,000 2,639,000  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down   $ 0 912,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   4    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 787    
Financing Receivable, Troubled Debt Restructurings Re-defaulted in Period, Recorded Investment, Not Within 12 Months of Original Modification     3,500,000  
Loans and Leases Receivable, Impaired, Commitment to Lend   $ 0 $ 0  
Financing Receivable, Modifications, Number of Contracts   4 8  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing   $ 0 $ 0  
Residential Real Estate, Foreclosed [Member]        
Number of Real Estate Properties   1    
Real Estate Investment Property, Net   $ 237,000    
Troubled Debt Restructuring [Member]        
Loans and Leases Receivable, Allowance   261,000 295,000  
Allowance for Loan and Lease Losses, Period Increase (Decrease)   1,000 2,000  
Nonaccrual Loans [Member]        
Financing Receivable, Collectively Evaluated for Impairment   800,000 800,000  
Performing Financial Instruments [Member]        
Financing Receivable, Modifications, Recorded Investment   4,200,000 5,000,000  
Nonperforming Financial Instruments [Member]        
Financing Receivable, Modifications, Recorded Investment   100,000 800,000  
Unallocated Financing Receivables [Member]        
Loans and Leases Receivable, Allowance     74,000  
Financing Receivable, Collectively Evaluated for Impairment  
Commercial Real Estate Portfolio Segment [Member]        
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 1,654,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 680,000    
Financing Receivable, Modifications, Number of Contracts   1  
Residential Portfolio Segment [Member]        
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 254,000 $ 810,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   3    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 107,000    
Number of Real Estate Properties   2 2  
Other Real Estate   $ 41,000 $ 41,000  
Financing Receivable, Modifications, Number of Contracts   2 5  
Residential Portfolio Segment [Member] | Troubled Debt Restructuring [Member]        
Allowance for Loan and Lease Losses, Period Increase (Decrease)   $ 37,000    
Consumer Portfolio Segment [Member]        
Financing Receivable, Collectively Evaluated for Impairment   127,547,000 $ 128,182,000 $ 121,731,000
Impaired Financing Receivable, Recorded Investment   297,000 351,000  
Impaired Financing Receivable, Related Allowance   1,000 1,000  
Financing Receivable, Modifications, Pre-Modification Recorded Investment    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts      
Financing Receivable, Modifications, Subsequent Default, Recorded Investment      
Mortgage Loans in Process of Foreclosure, Amount   $ 92,000 $ 340,000  
Financing Receivable, Modifications, Number of Contracts    
Consumer Portfolio Segment [Member] | In Process of Foreclosure [Member]        
Number of Real Estate Properties   5 3  
Small Business Administration [Member]        
Gain (Loss) on Sales of Loans, Net   $ 51,000    
Number of Loans Sold   3 0 0
Loans Sold During Period, Principal Balance   $ 1,300,000    
One- to Four-family Mortgages [Member]        
Recorded Investment of Mortgage Loans Sold $ 7,900,000 9,500,000   $ 8,300,000
Gain (Loss) on Sales of Loans, Net   340,000 $ 292,000 $ 292,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage   596,000 683,000  
Residential Mortgages [Member] | Small Business Administration [Member]        
Loans Serviced for Others, Unpaid Principal Balance   $ 103,500,000 $ 110,700,000