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Composition of Certain Financial Statement Items (Schedule of investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Marketable equity securities | $ 718 |

X
- Definition Amount of investments in equity securities and other forms of securities that provide ownership interests expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration