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Equity Incentive Plan - Activity (Details) - USD ($)
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Shares        
Outstanding at the beginning of the period (in shares) 1,036,017 1,199,307 1,356,528  
Exercised (in shares) (4,000) (150,290) (14,600)  
Forfeited or canceled (in shares) (10,500) (13,000) (142,621)  
Outstanding at the end of the period (in shares) 1,021,517 1,036,017 1,199,307 1,356,528
Weighted-Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 19.82 $ 19.97 $ 20.19  
Exercised (in dollars per share) 16.07 20.16 13.45  
Forfeited or canceled (in dollars per share) 30.92 29.82 22.71  
Outstanding at the end of the period (in dollars per share) $ 19.73 $ 19.82 $ 19.97 $ 20.19
Additional information        
Weighted Average Remaining Contractual Life 1 year 7 months 24 days 2 years 7 months 20 days 3 years 6 months 18 days 4 years 5 months 15 days
Aggregate Intrinsic Value $ 8,325,869 $ 11,312,871 $ 788,277 $ 1,481,585
Employee and Non Employees Stock Option        
Additional information        
Exercisable (in shares) 0