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Note 10. Stock Compensation Plans - Performance Shares Textuals (Details) - Performance Shares - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Stock Option and Incentive Plan 2014      
Share-based Compensation Arrangements      
Performance Shares, Unrecognized Compensation Cost $ 4.3    
Performance Shares, Average Vesting Period for Unrecognized Compensation Cost 10 months    
Performance Shares, Shares Vested 253,483 292,175 255,757
Share-based Compensation Arrangements, Vested in Period, Fair Value $ 3.9 $ 3.9 $ 2.9
Minimum      
Share-based Compensation Arrangements      
Share Based Compensation Arrangement By Share Based Payment Award Contractual Life 1 year    
Maximum      
Share-based Compensation Arrangements      
Share Based Compensation Arrangement By Share Based Payment Award Contractual Life 5 years