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Note 2 - Long-term Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 05, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument, Face Amount     $ 27,300    
Debt Conversion, Original Debt, Amount     38,900    
Gain (Loss) on Extinguishment of Debt, Total     (12,394) $ 0  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.01        
Debt Instrument, Prepayment Premium, Percent 7.00%        
Derivative Liability, Current $ 2,000   1,727   $ 0
Current Period Reclassification Adjustment 900        
Unamortized Debt Issuance Expense $ 1,100        
Fair Value Adjustment of Warrants     $ (259) $ 0  
2017 Warrants [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 362,500        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 6.75        
Preferred Class A [Member]          
Debt Instrument, Convertible, Number of Common Shares per One Preferred Share (in shares) 405.05        
2020 Convertible Senior Notes [Member]          
Debt Instrument, Interest Rate, Stated Percentage 7.00%        
Debt Instrument, Face Amount $ 27,400        
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member]          
Debt Conversion, Original Debt, Amount $ 27,300        
Debt Conversion, Converted Instrument, Shares Issued (in shares) 10,000        
Gain (Loss) on Extinguishment of Debt, Total   $ (12,400)      
Conversion of Convertible Senior Notes 2020 into Common Stock [Member]          
Debt Conversion, Original Debt, Amount $ 17,500        
Debt Conversion, Converted Instrument, Shares Issued (in shares) 2,600,000