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Note 9. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Jun. 30, 2020
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | $ 12,056 | $ 10,477
SERP obligation | 12,056 | 10,477
Prepaid Expenses and Other Current Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 2,552 | 1,972
Other Noncurrent Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 9,504 | 8,505
Other Current Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | 2,552 | 1,972
Other Noncurrent Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | $ 9,504 | $ 8,505

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