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Stock-Based Compensation - Stock Options (Details) - $ / shares
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Shares      
Total outstanding options at beginning of year (in shares) 173,348 185,473 144,000
Options granted (in shares) 0 0 69,973
Options exercised (in shares) (11,625) (12,125) (28,500)
Outstanding options at end of year (in shares) 161,723 173,348 185,473
Exercisable at end of year (in shares) 111,737 74,869 33,500
Weighted Average Exercise Price/Share      
Total outstanding Options at beginning of year (in dollars per share) $ 32.61 $ 32.51 $ 27.24
Options granted (in dollars per share) 0 0 40.82
Options exercised (in dollars per share) 32.24 31.08 26.29
Outstanding Options at end of year (in dollars per share) 32.64 32.61 32.51
Exercisable at end of year (in dollars per share) $ 30.32 $ 29.67 $ 26.97