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Note 9. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | $ 12,596 | $ 12,644
SERP obligation | 12,596 | 12,644
Prepaid Expenses and Other Current Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 3,054 | 3,095
Other Noncurrent Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 9,542 | 9,549
Other Current Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | 3,054 | 3,095
Other Noncurrent Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | $ 9,542 | $ 9,549

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