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Note 13. Fair Value - Textuals (Details) - USD ($)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Fair Value, Purchases and Sales of Level 3 Assets $ 0 $ 0
Fair Value, Purchases and Sales of Level 3 Liabilities $ 0 $ 0