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Note 7 - Loans Receivable and Allowance for Loan Losses (Details Textual)
1 Months Ended 12 Months Ended
Oct. 31, 2016
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Loans Receivable Held-for-sale, Amount   $ 0 $ 259,450  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 1,341,935 $ 919,729
Limit Over Which Private Mortgage Insurance is Required   80.00%    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   0 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts Sold 11      
Reserve for Off-balance Sheet Activities [Member]        
Valuation Allowances and Reserves, Balance   $ 55,000 $ 42,000  
Doubtful [Member]        
Loans Receivable, Net   $ 0 $ 0  
Minimum [Member]        
Maximum Percentage of Value of Property Against Lending   75.00%    
Maximum [Member]        
Maximum Percentage of Value of Property Against Lending   95.00%    
Real Estate Loans [Member] | One to four family, Residential [Member] | Legacy Loans [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 23,400,000