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Note 8. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | $ 6,676 | $ 6,166
SERP obligation | 6,676 | 6,166
Prepaid Expenses and Other Current Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 230 | 214
Other Noncurrent Assets |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP investments | 6,446 | 5,952
Other Current Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | 230 | 214
Other Noncurrent Liabilities |  |
Schedule of Trading Securities and Other Trading Assets |  |
SERP obligation | $ 6,446 | $ 5,952

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