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Note 8 - Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Apr. 19, 2017
Jan. 31, 2018
Jul. 31, 2012
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
[1]
Jun. 30, 2017
Debt Instrument, Convertible, Conversion Price       $ 0.74   $ 0.74  
Amortization of Debt Issuance Costs and Discounts, Total       $ 402,000 $ 80,000    
Interest Expense, Debt, Total       825,000 714,000    
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 $ 0.7359            
Debt Instrument, Convertible, Conversion Ratio 1.3589            
Beneficial Ownership Limitation, Percentage 4.99%            
Beneficial Ownership Limitation Percentage, Notice 61 days            
Beneficial Ownership Limitation After Notice, Percentage 9.99%            
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period One [Member]              
Debt Instrument, Convertible, Conversion Price Reset Period 90 days            
Debt Instrument, Convertible, Conversion Price Premium Percentage on Common Stock Share Price in Equity Financing 25.00%            
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member]              
Debt Instrument, Convertible, Conversion Price Premium Percentage on Common Stock Share Price in Equity Financing 35.00%            
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member] | Minimum [Member]              
Debt Instrument, Convertible, Conversion Price Reset Period 90 days            
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member] | Maximum [Member]              
Debt Instrument, Convertible, Conversion Price Reset Period 180 days            
Convertible 2022 Notes [Member]              
Debt Instrument, Interest Rate, Stated Percentage     7.50%        
Debt Instrument, Face Amount     $ 45,000,000        
Proceeds from Convertible Debt     40,900,000        
Discount on Sale of Convertible Notes     2,700,000        
Debt Issuance Costs, Gross     $ 1,400,000        
Debt Instrument, Interest Rate, Effective Percentage     7.50%        
Amortization of Debt Issuance Costs and Discounts, Total       0 80,000    
Expenses Related to Debt Conversion       20,000 1,200,000    
Interest Expense, Debt, Total       $ 0 $ 20,000    
Debt Discounts and Debt Issue Costs Amortization Rate       40.00%      
Debt Instrument, Convertible, Remaining Discount Amortization Period       5 years      
Debt Conversion, Original Debt, Amount   $ 500,000          
Debt Conversion, Converted Instrument, Shares Issued   780,303          
2020 Option Notes [Member]              
Debt Instrument, Convertible, Additional Convertible Amount $ 5,000,000            
Debt Instrument, Purchase Option Term 90 days            
Debt Instrument, Gain (Loss) on Exchange or Conversion $ (4,000,000)            
[1] The June 20, 2017 inputs represent the initial valuation of the 2020 Notes Embedded Derivative instrument that arose due to the exchange of the 2017 Notes for the 2020 Notes.