Note 7. Employee Benefit Plans - Severance Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Service cost	$ 364	$ 302	$ 328
Interest cost	49	39	50
Amortization of prior service cost	0	0	28
Amortization of actuarial (gain) loss	(358)	(317)	(254)
Net periodic benefit cost recognized in the Consolidated Statements of Income	$ 55	$ 24	$ 152