Accumulated Other Comprehensive Loss (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2017	$ (2,890)
Other comprehensive income before reclassifications	(432)
Amounts reclassified from accumulated other comprehensive income (loss)	48
Net current period other comprehensive income (loss)	(384)
Balance at March 31, 2018	(3,274)
Unrealized Gain / (Loss) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2017
Other comprehensive income before reclassifications	(311)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Net current period other comprehensive income (loss)	(311)
Balance at March 31, 2018	(311)
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	(203)
Amounts reclassified from accumulated other comprehensive income (loss)	48
Net current period other comprehensive income (loss)	(155)
Balance at March 31, 2018	(1,500)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at June 30, 2017	(1,545)
Other comprehensive income before reclassifications	82
Amounts reclassified from accumulated other comprehensive income (loss)	0
Net current period other comprehensive income (loss)	82
Balance at March 31, 2018	$ (1,463)