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Note 9. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | $ 11,067 | $ 10,477
SERP obligation | 11,067 | 10,477
Prepaid Expenses and Other Current Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 2,155 | 1,972
Other Noncurrent Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 8,912 | 8,505
Other Current Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | 2,155 | 1,972
Other Noncurrent Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | $ 8,912 | $ 8,505

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