Accumulated Other Comprehensive (Loss) Income (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2019	$ (6,579)
Other comprehensive income	420
Effect of deferred taxes on unrealized losses	(47)
Effect of exchange rates on the pension plans	0
Net current period other comprehensive income	373
Balance at June 30, 2020	(6,206)
Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2019	(1,707)
Other comprehensive income	167
Effect of deferred taxes on unrealized losses	0
Effect of exchange rates on the pension plans	23
Net current period other comprehensive income	190
Balance at June 30, 2020	(1,517)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2019	496
Other comprehensive income	50
Effect of deferred taxes on unrealized losses	0
Effect of exchange rates on the pension plans	(23)
Net current period other comprehensive income	27
Balance at June 30, 2020	523
Unrealized Loss on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2019	(5,368)
Other comprehensive income	203
Effect of deferred taxes on unrealized losses	(47)
Effect of exchange rates on the pension plans	0
Net current period other comprehensive income	156
Balance at June 30, 2020	$ (5,212)