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Note 7. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | $ 8,155 | $ 7,607
SERP obligation | 8,155 | 7,607
Prepaid Expenses and Other Current Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 274 | 258
Other Noncurrent Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 7,881 | 7,349
Other Current Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | 274 | 258
Other Noncurrent Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | $ 7,881 | $ 7,349

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