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Note 11 - Equity-Method Investment (Details) - Equity-Method Investment Recorded in Consolidated Balance Sheets - NMTC Program [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Other Noncurrent Assets [Member]    
Schedule of Equity Method Investments [Line Items]    
Carrying value, recorded as a component of other non-current assets $ 34,009 $ 33,282
Accrued Liabilities and Other Long-term Liabilities [Member]    
Schedule of Equity Method Investments [Line Items]    
Present value of obligation associated with future equity contributions, recorded as a component of accrued liabilities and other long-term liabilities $ 33,582 $ 32,177