Note 9. Investments - Supplemental Employee Retirement Investments Textuals (Details) - USD ($) $ in Thousands	9 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Schedule of Trading Securities and Other Trading Assets
Trading Securities, Change in net unrealized holding gains (losses)	$ 900	$ (600)

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.

No definition available.

Name:	us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration