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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