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Note 3 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructurings That Are Performing According to Their Restructured Terms
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]      
Number of contracts 1 0 6
Performing Financial Instruments [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 24 25  
Recorded investment $ 9,509 $ 10,391  
Performing Financial Instruments [Member] | Multi-family Residential Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 9 10  
Recorded investment $ 2,626 $ 3,034  
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 3 3  
Recorded investment $ 2,371 $ 2,373  
Performing Financial Instruments [Member] | One-to-Four Family - Mixed-Use Property Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 6 7  
Recorded investment $ 2,052 $ 2,381  
Performing Financial Instruments [Member] | One-to-Four Family Residential Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 1 1  
Recorded investment $ 343 $ 354  
Performing Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 1    
Recorded investment $ 34    
Performing Financial Instruments [Member] | Commercial Business and Other Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 4 4  
Recorded investment $ 2,083 $ 2,249