Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Financial Instruments (Details Textual)

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Note 12 - Financial Instruments (Details Textual)
3 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 0    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 0    
Restricted Cash and Investments, Noncurrent $ 7,800,000 $ 8,000,000 $ 8,000,000
Municipal Debt Securities, at Carrying Value   $ 2,200,000