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Note 9. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Schedule of Trading Securities and Other Trading Assets    
SERP investments $ 8,543 $ 8,769
SERP obligation 8,543 8,769
Prepaid Expenses and Other Current Assets    
Schedule of Trading Securities and Other Trading Assets    
SERP investments 303 294
Other Noncurrent Assets    
Schedule of Trading Securities and Other Trading Assets    
SERP investments 8,240 8,475
Other Current Liabilities    
Schedule of Trading Securities and Other Trading Assets    
SERP obligation 303 294
Other Noncurrent Liabilities    
Schedule of Trading Securities and Other Trading Assets    
SERP obligation $ 8,240 $ 8,475