Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Income Tax [Abstract]
Capital losses related to investments	$ 36,721	$ 43,569
Net operating loss carryforwards	32,459	35,821
Foreign tax credits	32,799	32,799
Provisions and accruals	3,936	13,230
FTS patent	181	277
Other	815	529
Total deferred tax assets before valuation allowance	106,911	126,225
Valuation allowances	(106,433)	(125,887)
Total deferred tax assets, net of valuation allowance	478	338
Intangible assets	171	340
Investments	1,755	1,019
Other	53	69
Total deferred tax liabilities	1,979	1,428
Long-term deferred tax assets	358	234	[1]
Long-term deferred tax liabilities	1,859	1,324	[1]
Net deferred income tax liabilities	$ 1,501	$ 1,090

[1] Refer to Note 1