Investments - Available-for-sale securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Adjusted Costs	$ 12,951	$ 12,908
Unrealized Gain	0	0
Unrealized Loss	(61)	(101)
Fair value	12,890	12,807
Mutual Funds - Corporate & Government Debt
Schedule of Available-for-sale Securities [Line Items]
Adjusted Costs	9,104	12,908
Unrealized Gain	0	0
Unrealized Loss	(61)	(101)
Fair value	9,043	$ 12,807
Fixed Income Bonds
Schedule of Available-for-sale Securities [Line Items]
Adjusted Costs	3,048
Unrealized Gain	0
Unrealized Loss	0
Fair value	3,048
Time Deposits
Schedule of Available-for-sale Securities [Line Items]
Adjusted Costs	799
Unrealized Gain	0
Unrealized Loss	0
Fair value	$ 799