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Note 9. Investments - Supplemental Employee Retirement Investments Textuals (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Schedule of Trading Securities and Other Trading Assets |  |
Trading Securities, Change in net unrealized holding gains (losses) | $ 200 | $ (100)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration