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Note 6 - Loans Receivable and Allowance for Loan Losses (Details Textual)
3 Months Ended 6 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Aug. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 1,228,972 $ 1,737,450   $ 1,228,972 $ 1,737,450     $ 1,341,935 $ 919,729
Limit Over Which Private Mortgage Insurance is Required 80.00%     80.00%          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Change in Accretion $ 1,085 7,016   $ 725 13,543        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions $ 0 $ 0   $ 55,046        
Financing Receivable, Modifications, Number of Contracts 0 0              
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0     $ 0          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0   0          
Doubtful [Member]                  
Loans Receivable, Net $ 0     $ 0       0  
Unlikely to be Collected Financing Receivable [Member]                  
Loans Receivable, Net 0     0       0  
Reserve for Off-balance Sheet Activities [Member]                  
Valuation Allowances and Reserves, Balance $ 68,500     $ 68,500         $ 55,000
Minimum [Member]                  
Maximum Percentage of Value of Property Against Lending 75.00%     75.00%          
Maximum [Member]                  
Maximum Percentage of Value of Property Against Lending 95.00%     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  
Real Estate Loans [Member] | One-to four-family [Member]                  
Financing Receivable, Modifications, Number of Contracts       1 11        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts       0 11        
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 451,000            
Commercial Portfolio Segment [Member] | Legacy Loans [Member]                  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net             $ 15,400,000    
Consumer Portfolio Segment [Member] | Recreational Vehicle Loans [Member] | Legacy Loans [Member]                  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net           $ 18,400,000