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Note 6 - Long-term Debt (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jan. 01, 2019
May 25, 2017
May 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 26, 2016
Convertible Debt, Total       $ 65,200,000      
Debt Instrument, Convertible, Difference Between Fair Value and Carrying Value       41,400,000      
Current Period Reclassification Adjustment $ 865,000     865,000 [1]      
Additional Paid-in Capital [Member]              
Current Period Reclassification Adjustment [1]       2,896,000      
Reclassification of Warrant Liability to Additional Paid-in Capital [Member]              
Current Period Reclassification Adjustment 865,000     $ 30,000      
Gains from Revaluating Warrants         $ 1,500,000 $ 500,000  
Reclassification of Warrant Liability to Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member]              
Cumulative Effect of New Accounting Principle in Period of Adoption 2,000,000            
Reclassification of Warrant Liability to Additional Paid-in Capital [Member] | Retained Earnings [Member]              
Cumulative Effect of New Accounting Principle in Period of Adoption $ 2,000,000            
2017 Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   362,500          
Warrants and Rights Outstanding, Term   5 years          
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 14.94   $ 14.54      
Warrants and Rights Outstanding   $ 2,900,000          
Senior Secured Debt [Member]              
Debt Instrument, Fee Amount   60,000,000          
Debt Instrument, Additional Amount after Refinance   $ 15,000,000 $ 15,000,000        
Debt Instrument, Payment-in-kind Rate   6.00%          
Debt Instrument, Cash Rate   2.00%          
Debt Instrument, Interest Rate, Stated Percentage   3.00%          
Upfront Fee, Recorded as Additional Debt Discount, Percentage   2.00%          
Prior Senior Secured Debt [Member]              
Extinguishment of Debt, Amount   $ 45,000,000 $ 45,000,000        
2020 Convertible Senior Notes [Member]              
Convertible Debt, Total       $ 65,514,000 $ 73,158,000    
Debt Instrument, Interest Rate, Stated Percentage       7.00% 7.00%   7.00%
Debt Instrument, Periodic Payment, Total       $ 0      
Measurement Input, Exercise Price [Member]              
Debt Instrument, Measurement Input       6.75      
Measurement Input, Share Price [Member]              
Debt Instrument, Measurement Input       11.02      
Measurement Input, Price Volatility [Member]              
Debt Instrument, Measurement Input       0.32      
[1] A cumulative effect adjustment of $2,031 thousand was recognized as of January 1, 2019, upon adoption of ASU 2017-11.