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Note 15. Investments - Supplemental Employee Retirement Plan Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Schedule of Trading Securities and Other Trading Assets    
SERP Investment $ 12,644 $ 10,477
SERP Obligation 12,644 10,477
Prepaid Expenses and Other Current Assets    
Schedule of Trading Securities and Other Trading Assets    
SERP Investment 3,095 1,972
Other Noncurrent Assets    
Schedule of Trading Securities and Other Trading Assets    
SERP Investment 9,549 8,505
Other Current Liabilities    
Schedule of Trading Securities and Other Trading Assets    
SERP Obligation 3,095 1,972
Other Noncurrent Liabilities    
Schedule of Trading Securities and Other Trading Assets    
SERP Obligation $ 9,549 $ 8,505