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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended
May 13, 2016
USD ($)
$ / shares
Sep. 11, 2015
USD ($)
Oct. 10, 2012
USD ($)
$ / shares
shares
Jun. 30, 2018
shares
Mar. 31, 2018
shares
Apr. 15, 2015
$ / shares
Common Stock, Shares, Issued, Total | shares     3,703,000 3,416,414 3,407,613  
Share Price | $ / shares     $ 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      
Number of Branches       7    
Core Deposits [Member]            
Finite-Lived Intangible Asset, Useful Life       8 years    
Fraternity Community Bancorp, Inc. [Member]            
Business Acquisition, Share Price | $ / shares $ 19.25          
Payments to Acquire Businesses, Gross $ 25,700,000          
Fairmount Bancorp, Inc. [Member]            
Business Acquisition, Share Price | $ / shares           $ 30
Business Combination, Consideration Transferred, Total   $ 15,400,000