Short-Term And Long-Term Investments (Schedule Of Short-Term And Long-Term Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	$ 448	$ 1,431
Long-term investments	725	725
Bank Guarantees [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	232	258
Preferred Stock [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Long-term investments	725
Cost [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	448	1,431
Long-term investments	3,700	3,700
Total Investments	4,148	5,131
Cost [Member] | Bank Guarantees [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	232	258
Cost [Member] | Time/Fixed Deposits [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	216	1,173
Cost [Member] | Preferred Stock [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Long-term investments	3,700	3,700
Fair Value Or Carrying Value [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	448	1,431
Long-term investments	725	725
Total Investments	1,173	2,156
Fair Value Or Carrying Value [Member] | Bank Guarantees [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	232	258
Fair Value Or Carrying Value [Member] | Time/Fixed Deposits [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Short-term investments	216	1,173
Fair Value Or Carrying Value [Member] | Preferred Stock [Member]
Investments, Debt and Equity Securities Statement [Line Items]
Long-term investments	$ 725	$ 725