Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Financial Instruments (Details Textual)

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Note 11 - Financial Instruments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Restricted Cash and Investments, Noncurrent $ 7,000 $ 7,300
Available-for-sale Securities 0 $ 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 0