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Note 15. Investments - Investments-Supplemental Employee Retirement Plan Investments Textuals (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Schedule of Trading Securities and Other Trading Assets      
Trading Securities, Change in Unrealized Holding Gain (Loss) $ 1,500 $ 400 $ 100