Financial Instruments (Summary Of Investments Measured And Recorded At Fair Value On A Recurring Basis) (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	$ 1,602,000	$ 2,297,000
Other-than-temporary impairments	0	0
Mutual Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	23,000
Time/Fixed Deposits And Bank Guarantees [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	854,000	1,572,000
Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	725,000	725,000
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	23,000
Level 1 [Member] | Mutual Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	23,000
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	854,000	1,572,000
Level 2 [Member] | Time/Fixed Deposits And Bank Guarantees [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	854,000	1,572,000
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	725,000	725,000
Level 3 [Member] | Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Investments	$ 725,000	$ 725,000