Note 11. Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Reconciliation, Income Tax Expense (Benefit), Tax Computed at U.S. Federal Statutory Rate		$ 5,283	$ 8,082	$ 12,582
Effective Income Tax Rate Reconciliation, Tax Computed at U.S. Federal Statutory Rate	35.00%	21.00%	21.00%	28.10%
Income Tax Reconciliation, State Income Taxes, Net of Federal Income Tax Benefit		$ (1,128)	$ (320)	$ (408)
Effective Income Tax Rate Reconciliation, State Income Taxes, Net of Federal Income Tax Benefit		(4.50%)	(0.80%)	(0.90%)
Income Tax Reconciliation, Foreign Tax Effect		$ 714	$ 313	$ (1,615)
Effective Income Tax Rate Reconciliation, Foreign Tax Effect		2.80%	0.80%	(3.60%)
Income Tax Rate Reconciliation, Impact of Foreign Exchange Rates, Amount		$ 867	$ 156	$ 180
Effective Income Tax Rate Reconciliation Impact of Foreign Exchange Rates, Foreign, Percent		3.40%	0.40%	0.40%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount		$ 388	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent		1.50%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ 979	$ 20	$ 638
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent		3.90%	0.10%	1.40%
Income Tax Reconciliation, Research Credit		$ (1,056)	$ (627)	$ (378)
Effective Income Tax Rate Reconciliation, Research Credit		(4.20%)	(1.60%)	(0.80%)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount		$ 0	$ (416)	$ 13,436
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings Adjustment, Provisional Income Tax Expense (Benefit), Amount		0.000	(0.011)	0.300
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Net Deferred Tax Assets, Provisional Income Tax Expense (Benefit), Amount		$ 0	$ (10)	$ 4,357
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Net Deferred Tax Assets, Provisional Income Tax Expense (Benefit), Percent		0.00%	0.00%	9.70%
Effective Income Tax Reconciliation Tax Cuts and Jobs Act 2017 Global Intangible Low-Taxed Income Provisions, Amount		$ 607	$ 0	$ 0
Effective Income Tax Reconciliation Tax Cuts and Jobs Act 2017 Global Intangible Low-Taxed Income Provisions, Percent		2.40%	0.00%	0.00%
Income Tax Reconciliation, Other-Net		$ 307	$ (271)	$ (769)
Effective Income Tax Rate Reconciliation, Other-Net		1.40%	(0.80%)	(1.70%)
Provision for Income Taxes		$ 6,961	$ 6,927	$ 28,023
Effective Income Tax Rate		27.70%	18.00%	62.60%