Note 14 - Shareholders' Equity (Deficit) (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended 16 Months Ended
Nov. 08, 2016
Oct. 26, 2016
Mar. 10, 2016
Nov. 08, 2013
Jul. 17, 2013
Jun. 30, 2012
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
May 19, 2016
May 18, 2016
Jul. 15, 2015
Sep. 09, 2014
Oct. 24, 2013
Feb. 28, 2013
Feb. 27, 2013
Jul. 02, 2012
Common Stock, Shares Authorized               1,100,000,000 1,100,000,000     1,100,000,000 1,100,000,000 700,000,000     700,000,000 500,000,000 400,000,000  
Proceeds from Issuance of Common Stock               $ 62,650 $ 1,568 $ 16,000                    
Warrants and Rights Outstanding               $ 18,179 $ 18,179     $ 18,179     $ 18,179          
Preferred Stock, Shares Outstanding               0 0   0 0                
Investor Identification Agreement [Member]                                        
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs $ 750                                      
Common Stock [Member]                                        
Stock Issued During Period, Shares, New Issues               405,000,000 12,500,000 85,355,615                    
Conversion of Stock, Shares Issued                     16,896,070                  
Series A Preferred Stock [Member]                                        
Conversion of Stock, Shares Converted                     506,936                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                             29,779,557          
Minimum [Member]                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights                             $ 0.48          
Maximum [Member]                                        
Class of Warrant or Right, Exercise Price of Warrants or Rights                             $ 0.49          
Private Placement [Member]                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights               10,540,750                       18,750,000
Class of Warrant or Right, Exercise Price of Warrants or Rights               $ 0.17 $ 0.19     $ 0.19               $ 0.384
Private Placement [Member] | Senior Convertible Notes [Member]                                        
Debt Conversion, Converted Instrument, Shares Issued         163,641,547                              
Debt Instrument, Periodic Payment, Principal         $ 12,000                              
Debt Instrument, Periodic Payment, Interest         $ 680                              
Private Placement [Member] | Senior Convertible Notes [Member] | Weighted Average [Member]                                        
Debt Instrument, Convertible, Conversion Price         $ 0.0774                              
Private Placement [Member] | Visser MTA Agreement [Member]                                        
Stock Issued During Period, Shares, New Issues           30,000,000                            
Common Stock Purchase Agreement [Member]                                        
Stock Issued During Period, Shares, New Issues                   85,355,615                    
Stock Issued During Period, Shares, Other       2,666,667                                
Stock Issued During Period, Value, New Issues                   $ 16,000                    
Common Stock Purchase Agreement [Member] | Weighted Average [Member]                                        
Share Price                   $ 0.19                    
The 2014 Purchase Agreement [Member]                                        
Stock Issued During Period, Shares, New Issues             12,500,000                          
Common Stock, Shares Covered by Registration Statement                               75,000,000        
Proceeds from Issuance of Common Stock             $ 1,568         $ 1,568                
The 2014 Purchase Agreement [Member] | Common Stock [Member]                                        
Stock Issued During Period, Shares, New Issues                       12,500,000                
Stock Issued During Period, Weighted Average Price Per Share             $ 0.13         $ 0.13                
The 2016 Purchase Plan [Member]                                        
Stock Issued During Period, Shares, New Issues     105,000,000                                  
Stock Issued During Period, Value, New Issues     $ 8,400                                  
Sale of Stock, Price Per Share     $ 0.08                                  
The 2016 Purchase Agreement [Member]                                        
Stock Issued During Period, Shares, New Issues   300,000,000 105,000,000                                  
Stock Issued During Period, Value, New Issues   $ 55,000 $ 8,400                                  
Sale of Stock, Price Per Share     $ 0.08                                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     10,066,809                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.07                                  
The 2016 Purchase Agreement [Member] | Common Stock, Purchase Price per Share of $0.15 [Member]                                        
Stock Issued During Period, Shares, New Issues   200,000,000                                    
Sale of Stock, Price Per Share   $ 0.15                                    
The 2016 Purchase Agreement [Member] | Common Stock, Purchase Price per Share of $0.25 [ Member]                                        
Stock Issued During Period, Shares, New Issues   100,000,000                                    
Sale of Stock, Price Per Share   $ 0.25