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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, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 1,021,424 $ 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      
Loans and Leases Receivable, Impaired, Commitment to Lend   $ 0    
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance   50,200 $ 55,200  
Doubtful [Member]        
Loans Receivable, Net, Total   $ 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   $ 19,200,000 $ 23,400,000  
Commercial Portfolio Segment [Member] | Commercial Lease Loans Purchased [Member] | Legacy Loans [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   15,500,000    
Commercial Portfolio Segment [Member] | Guaranteed SBA Purchased Loans [Member] | Legacy Loans [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   3,200,000    
Commercial Portfolio Segment [Member] | Recreational Vehicle Loans [Member] | Legacy Loans [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   $ 19,900,000