Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2017	$ (2,890)
Other comprehensive income before reclassifications	512
Amounts reclassified from accumulated other comprehensive income (loss)	65
Net current period other comprehensive income (loss)	577
Balance at June 30, 2018	(2,313)
Unrealized Gain / (Loss) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2017	0
Other comprehensive income before reclassifications	(1,373)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Net current period other comprehensive income (loss)	(1,373)
Balance at June 30, 2018	(1,373)
Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2017	(1,345)
Other comprehensive income before reclassifications	(92)
Amounts reclassified from accumulated other comprehensive income (loss)	65
Net current period other comprehensive income (loss)	(27)
Balance at June 30, 2018	(1,372)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2017	(1,545)
Other comprehensive income before reclassifications	1,977
Amounts reclassified from accumulated other comprehensive income (loss)	0
Net current period other comprehensive income (loss)	1,977
Balance at June 30, 2018	$ 432