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Note 12 - Equity-Method Investment Recorded in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Other Noncurrent Assets [Member]    
Carrying value, recorded as a component of other non-current assets $ 28,147 $ 33,282
Accrued Liabilities and Other Long Term Liabilities [Member]    
Present value of obligation associated with future equity contributions, recorded as a component of accrued liabilities and other long-term liabilities $ 28,061 $ 32,177