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Note 11 - Long-Term Debt Schedule of Convertible Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 27, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]            
Net carrying amount   $ 989,010   $ 989,010   $ 1,069,537
Equity component of currently redeemable convertible senior notes   16   16   0
Convertible Senior Notes Due 2017            
Debt Instrument [Line Items]            
Repayments of Convertible Debt   31,600        
Debt Instrument, Convertible, Carrying Amount of Equity Component   100   100   5,000
Net carrying amount   625   625   20,947
Equity component of currently redeemable convertible senior notes   16   16   0
Convertible Senior Notes Due 2019            
Debt Instrument [Line Items]            
Repayments of Convertible Debt $ 110,100          
Debt Instrument, Convertible, Carrying Amount of Equity Component           13,100
Net carrying amount   0   0   62,013
Equity component of currently redeemable convertible senior notes   0   0   0
Convertible Debt | Convertible Senior Notes Due 2017            
Debt Instrument [Line Items]            
Principal amount of convertible debt in liabilities   642   642   22,233
Less: Debt discount, net (1) [1]   (16)   (16)   (1,221)
Less: Debt issuance costs (1) [1]   (1)   (1)   (65)
Net carrying amount   625   625   20,947
Contractual interest expense (benefit) [2]   141 $ 167 308 $ 539  
Amortization of debt issuance costs   14 17 32 54  
Amortization of debt discount   267 314 605 1,022  
Total interest expense (benefit) [2]   422 498 945 1,615  
Convertible Debt | Convertible Senior Notes Due 2019            
Debt Instrument [Line Items]            
Principal amount of convertible debt in liabilities   0   0   68,024
Less: Debt discount, net (1) [1]   0   0   (5,461)
Less: Debt issuance costs (1) [1]   0   0   (550)
Net carrying amount   0   0   $ 62,013
Contractual interest expense (benefit) [3]   0 537 (510) 2,550  
Amortization of debt issuance costs   0 80 16 373  
Amortization of debt discount   0 788 163 3,697  
Total interest expense (benefit) [3]   $ 0 $ 1,405 $ (331) $ 6,620  
[1] Included within long-term debt and is being amortized over the life of the convertible notes.
[2] Interest expense (benefit) represents expense incurred, net of adjustments to accruals previously recorded.
[3] Interest expense (benefit) represents expense incurred, net of adjustments to accruals previously recorded.