Accumulated Other Comprehensive Loss (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	$ (6,579)
Other comprehensive income (loss) before reclassifications	(2,910)
Net current period other comprehensive income (loss)	(2,910)
Ending Balance at March 31, 2020	(9,489)
Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	(1,707)
Other comprehensive income (loss) before reclassifications	66
Effect of exchange rates on the pension plans	55
Net current period other comprehensive income (loss)	121
Ending Balance at March 31, 2020	(1,586)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	496
Other comprehensive income (loss) before reclassifications	135
Effect of exchange rates on the pension plans	(55)
Net current period other comprehensive income (loss)	80
Ending Balance at March 31, 2020	576
Unrealized Loss on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	(5,368)
Other comprehensive income (loss) before reclassifications	(3,111)
Net current period other comprehensive income (loss)	(3,111)
Ending Balance at March 31, 2020	$ (8,479)