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Note 11 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 24, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 13, 2020
Stock Repurchased During Period, Shares (in shares)   0 0 0    
Dividends, Common Stock, Cash   $ 0 $ 0 $ 0    
Class Of Warrant Or Right Issued (in shares)         11,543,814  
Percentage of Ownership of Outstanding Common Stock, Subject to Dilution           4.99%
Percentage of Additional Ownership Over 4.99% in Otustanding Common Stock, Subject to Dilution           0.50%
Number of Rights Issued Per Common Stock Owned (in shares) 1          
Preferred Stock, No Par Value (in dollars per share)   $ 0 $ 0      
Series A Junior Participating Preferred Stock [Member]            
Number of Shares Per Right (in shares) 0.001          
Preferred Stock, No Par Value (in dollars per share) $ 0          
Shares Issued, Price Per One One Thousandths of a Share (in dollars per share) 38.00          
Redemption Price, Per Right (in dollars per share) $ 0.001          
Domestic Tax Authority [Member]            
Operating Loss Carryforwards, Total   $ 320,700 $ 300,000      
Foreign Tax Authority [Member]            
Operating Loss Carryforwards, Total   110,900        
Tax Credit Carryforward, Amount   $ 387,400        
Series A Warrants [Member]            
Class Of Warrant Or Right Issued (in shares)         2,432,432  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 57.06  
Class of Warrant or Right, Exercised During Period (in shares)   0        
Series B Warrants [Member]            
Class Of Warrant Or Right Issued (in shares)         2,629,657  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 62.28  
Class of Warrant or Right, Exercised During Period (in shares)   0        
New Creditor Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.01        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   657,203        
Class Of Warrant Or Right, Assumed During Period (in shares)   2,300,000        
Equity Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 100        
Class Of Warrant Or Right, Assumed During Period (in shares)   800,000        
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1.1        
GLF Equity Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   815,575        
Class of Warrant or Right, Exercised During Period (in shares)   0