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Stock-Based Compensation - Stock Options (Details) - $ / shares
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Shares      
Total outstanding options at beginning of year (in shares) 185,473 144,000 104,000
Options granted (in shares) 0 69,973 40,000
Options exercised (in shares) (12,125) (28,500) 0
Options cancelled (in shares) 0 0 0
Outstanding options at end of year (in shares) 173,348 185,473 144,000
Exercisable at end of year (in shares) 74,869 33,500 26,000
Weighted Average Exercise Price/Share      
Total outstanding Options at beginning of year (in dollars per share) $ 32.51 $ 27.24 $ 25.85
Options granted (in dollars per share) 0 40.82 30.87
Options exercised (in dollars per share) 31.08 26.29 0
Options cancelled (in dollars per share) 0 0 0
Outstanding Options at end of year (in dollars per share) 32.61 32.51 27.24
Exercisable at end of year (in dollars per share) $ 29.67 $ 26.97 $ 25.85