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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
May 13, 2016
USD ($)
$ / shares
Sep. 11, 2015
USD ($)
Oct. 10, 2012
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Apr. 15, 2015
$ / shares
Oct. 31, 2012
$ / shares
shares
Common Stock, Shares, Issued, Total | shares     3,703,000 3,407,613 3,411,075    
Share Price | $ / shares     $ 10       $ 10
Proceeds from Issuance of Common Stock     $ 35,580,000        
Noninterest Expense Offering Cost     $ 1,450,000        
Employee Stock Option Plan, Subscribed Percentage     8.00%        
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares | shares     296,240 88,872 74,060   296,240
Number of Branches       7      
Investment in Federal Home Loan Bank Stock Par Value Per Share | $ / shares       $ 100      
Federal Home Loan Bank Stock       $ 3,122,400 $ 2,020,200    
Core Deposits [Member]              
Finite-Lived Intangible Asset, Useful Life 8 years     8 years      
Fraternity Community Bancorp, Inc. [Member]              
Business Acquisition, Share Price | $ / shares $ 19.25            
Payments to Acquire Businesses, Gross $ 25,700,000     $ 25,704,871    
Fairmount Bancorp, Inc. [Member]              
Business Acquisition, Share Price | $ / shares           $ 30  
Business Combination, Consideration Transferred, Total   $ 15,400,000