Supplemental Financial Information - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss)
Balance	$ 49,871	$ 48,632
Balance	63,635	49,871
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss)
Balance	990	1,237
Other comprehensive loss	(238)	(247)
Balance	752	990
Change in Defined Pension Benefit Obligation
Accumulated Other Comprehensive Income (Loss)
Balance	(1,000)	(144)
Other comprehensive loss	(236)	(856)
Balance	(1,236)	(1,000)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance	(10)	1,093
Other comprehensive loss	(474)	(1,103)
Balance	$ (484)	$ (10)