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Note 6 - Loans Receivable and Allowance for Loan Losses (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
Sep. 30, 2016
USD ($)
Sep. 30, 2015
Mar. 31, 2016
USD ($)
Doubtful [Member]              
Loans Receivable, Net   $ 0     $ 0   $ 0
Unlikely to be Collected Financing Receivable [Member]              
Loans Receivable, Net   0     $ 0   0
Real Estate Loans [Member] | One-to four-family [Member]              
Financing Receivable, Modifications, Subsequent Default, Number of Contracts         11    
Loans Receivable Held-for-sale, Amount   $ 655,949     $ 655,949    
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ 394,386   $ 451,223   $ 451,000    
Financing Receivable, Modifications, Number of Contracts       2 11 2  
Maximum Percentage of Value of Property Against Lending   90.00%     90.00%    
Limit Over Which Private Mortgage Insurance is Required   80.00%     80.00%    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   0   0 0 0  
Loans Receivable Held-for-sale, Amount   $ 1,446,000     $ 1,446,000   $ 259,450