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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Stock Settled Stock Appreciation Rights SARS [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) |  |  | 3 years
Unrecognized compensation expense | $ 0.8 |  |
Weighted-average period over which remaining compensation expense will be recognized (in years) | 1 year |  |
Employee Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 3 years | 3 years | 3 years
Director Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 1 year | 1 year | 1 year
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 5.1 |  |
Weighted-average period over which remaining compensation expense will be recognized (in years) | 2 years |  |
Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 3 years | 3 years |
Unrecognized compensation expense | $ 4.2 |  |
Weighted-average period over which remaining compensation expense will be recognized (in years) | 2 years |  |
Performance period | 3 years | 3 years |
Maximum [Member] | Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage to be used to settle performance units in shares of common stock based on achievement of performance metrics | 200.00% | 200.00% |
Minimum [Member] | Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage to be used to settle performance units in shares of common stock based on achievement of performance metrics | 0.00% | 0.00% |
2015 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common shares reserved for issuance to employees and directors | 1,500,000 |  |
2015 Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum term of stock awards granted (in years) | 7 years |  |

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