Income Taxes (Schedule of Components of Deferred Taxes) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Benefit of net operating losses	$ 9,187	$ 8,749
Tax credit carry-forwards	5,804	6,776
Deferred revenue	499	781
Impaired investment	688	691
Property and intangible assets	302	436
Other	1,330	1,390
Deferred tax asset	17,810	18,823
Valuation allowance	(17,229)	(17,976)
Total deferred tax assets	581	847
Deferred tax liabilities - basis difference and amortization	(115)	(268)
Net deferred tax liabilities	$ 466	$ 579