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Note 5 - Loans (Details) - Troubled Debt Restructurings That Are Not Performing According to Their Restructured Terms
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]          
Number of contracts 0 0 1 0  
Nonperforming Financial Instruments [Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts 0 0 1   2
Recorded investment $ 382   $ 382   $ 2,439
Nonperforming Financial Instruments [Member] | Multi-Family Residential Portfolio Segment[Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     1   0
Recorded investment 382   $ 382   $ 0
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     0   1
Recorded investment 0   $ 0   $ 2,252
Nonperforming Financial Instruments [Member] | One-To-Four Family - Mixed-Use Property Portfolio Segment[Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     0 1 1
Recorded investment $ 0 $ 300 $ 0 $ 300 $ 187