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Note 9 - Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 10, 2020
Apr. 19, 2017
Apr. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 31, 2020
Dec. 31, 2019
Jun. 30, 2017
Gain (Loss) on Extinguishment of Debt, Total       $ (57) $ (726)      
Notes Payable, Other Payables [Member]                    
Long-term Debt, Total       $ 1,377   1,377     $ 749  
Debt Instrument, Periodic Payment, Total           $ 100        
Notes Payable, Other Payables [Member] | Minimum [Member]                    
Debt Instrument, Interest Rate, Stated Percentage       4.00%   4.00%        
Notes Payable, Other Payables [Member] | Maximum [Member]                    
Debt Instrument, Interest Rate, Stated Percentage       21.00%   21.00%        
Convertible 2020 Notes [Member]                    
Debt Instrument, Interest Rate, Stated Percentage   12.00%               12.00%
Debt Instrument, Interest Rate, Paid In Kind Percentage   2.00%                
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 14.72                
Debt Instrument, Convertible, Conversion Ratio   0.0679                
Long-term Debt, Total                 14,100  
Gain (Loss) on Extinguishment of Debt, Total           $ (700)        
Beneficial Ownership Limitation, Percentage   4.99%                
Beneficial Ownership Limitation Percentage, Notice (Day)   61 days                
Beneficial Ownership Limitation After Notice, Percentage   9.99%                
Convertible 2020/21 Notes [Member]                    
Debt Instrument, Interest Rate, Stated Percentage 12.00%             12.00%    
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 2.442                  
Debt Instrument, Convertible, Conversion Ratio 0.4095                  
Debt Instrument, Face Amount $ 14,400                  
Maximum Principal Amount of Notes Issuable Upon Option Exercise $ 7,100                  
Original Issue Discount 2.00%                  
Debt Instrument, Indenture, Maturity Extension, Trigger, Outstanding Balance $ 7,000                  
Debt Instrument, PIK Interest 4.00%                  
Debt Instrument, Conversion Price Reduction, Discount Rate 10.00%                  
SBA Loans [Member]                    
Debt Instrument, Periodic Payment, Total     $ 60              
Proceeds from Paycheck Protection Program Under CARES Act     $ 1,000              
SBA Loans [Member] | Notes Payable, Other Payables [Member]                    
Long-term Debt, Total       $ 1,006   $ 1,006