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Employee Benefit Plan - Shares Awarded (Details) - $ / shares
9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restricted stock    
Service-Based Stock Awards    
Non-vested at beginning of the year (in shares) 39,281 43,094
Conversion for stock offering (in shares)   3,907
Granted (in shares) 63,461 4,900
Vested (in shares) (7,294) (6,297)
Non-vested at end of the year (in share) 95,448 45,604
Weighted Grant Date Fair Value    
Non-vested at beginning of the year (in dollars per share) $ 4.32 $ 4.02
Granted (in dollars per share) 9.90 8.53
Vested (in dollars per share) 5.40 4.93
Non-vested at end of the year (in dollars per share) $ 6.97 $ 4.02
2006 Equity Incentive Plan    
Share-based compensation    
Award vesting period 5 years  
2016 Equity Incentive Plan | Stock options    
Share-based compensation    
Number of shares authorized 198,316  
Number of shares awarded 158,653  
2016 Equity Incentive Plan | Restricted stock    
Share-based compensation    
Number of shares authorized 79,326  
Number of shares awarded 63,461