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Note 5 - Loans (Details) - Troubled Debt Restructurings That Are Performing According to Their Restructured Terms
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
Sep. 30, 2015
USD ($)
Sep. 30, 2014
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]          
Number of contracts 0 0 1 0  
Performing Financial Instruments [Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     25   25
Recorded investment $ 9,851   $ 9,851   $ 10,391
Performing Financial Instruments [Member] | Multi-Family Residential Portfolio Segment[Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     9   10
Recorded investment 2,647   $ 2,647   $ 3,034
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     3   3
Recorded investment 2,349   $ 2,349   $ 2,373
Performing Financial Instruments [Member] | One-To-Four Family - Mixed-Use Property Portfolio Segment[Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     7   7
Recorded investment 2,347   $ 2,347   $ 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 346   $ 346   $ 354
Performing Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     1   0
Recorded investment 37   $ 37   $ 0
Performing Financial Instruments [Member] | Commercial Business And Other Portfolio Segment[Member]          
Financing Receivable, Modifications [Line Items]          
Number of contracts     4   4
Recorded investment $ 2,125   $ 2,125   $ 2,249