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Stock-Based Compensation - Stock Options (Details) - $ / shares
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Total outstanding Options at beginning of year (in shares) 144,000 104,000 0
Options granted (in shares) 69,973 40,000 104,000
Options exercised (in shares) (28,500) 0 0
Options cancelled (in shares) 0 0 0
Outstanding Options at end of year (in shares) 185,473 144,000 104,000
Exercisable at end of year (in shares) 33,500 26,000 0
Price per share      
Total outstanding Options at beginning of year (in dollars per share) $ 27.24 $ 25.85 $ 0.00
Options granted (in dollars per share) 40.82 30.87 25.85
Options exercised (in dollars per share) 26.29 0.00 0.00
Options cancelled (in dollars per share) 0.00 0.00 0.00
Outstanding Options at end of year (in dollars per share) 32.51 27.24 25.85
Exercisable at end of year (in dollars per share) $ 26.97 $ 25.85 $ 0.00