Note 11. Income Taxes - Textuals (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Deferred Tax Liabilities, Intangible Assets		$ 1,313	$ 1,412
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	21.00%	21.00%	28.10%
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)				$ 17,800
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Net Deferred Tax Assets, Provisional Income Tax Expense (Benefit)				4,400
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit)				13,400
Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings Adjustment, Provisional Income Tax Expense (Benefit)			$ 400
Long-term income taxes payable		$ 9,765	9,765
Deferred Tax Assets, Valuation Allowance		1,637	658
Undistributed Earnings of Foreign Subsidiaries		270,000
Income Taxes Paid (Refunded), Net		9,096	10,172	$ 14,724
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 1,600	$ 1,600