Income Taxes (Schedule of Components of Deferred Taxes) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Benefit of net operating losses	$ 7,334	$ 8,787	$ 9,268
Tax credit carry-forwards	7,475	5,284	5,451
Deferred revenue	1,668	2,073	1,434
Impaired investment	677	1,054	1,060
Property and intangible assets	61	187	242
Other	1,885	2,161	3,029
Deferred tax asset	19,100	19,546	20,484
Valuation allowance	(17,845)	(19,099)	(19,453)
Total deferred tax assets	1,255	447	1,031
Deferred tax liabilities - basis difference and amortization	(1,917)	(1,623)	(1,631)
Net deferred tax liabilities	$ (662)	$ (1,176)	$ (600)