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Note 7 - Convertible Debt (PIK Notes) (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Debt Instrument Redemption [Table Text Block]
Key Terms
  
Series 2023 Notes
    
Series A Notes
  
Inception Date
  
   08/01/2013
    
   11/03/2014
  
Cash Received
    
$10,500,000
      
$12,500,000
  
Principal (Initial Liability)
    
$10,500,000
      
$19,848,486
  
Maturity (Term)
  
Matures on August 1, 2023, but convertible into shares of the Company’s common stock at the discretion of the holder or by the Company based on the market price of the Company’s stock;
    
Matures on May 1, 2023 but extends to August 1, 2023 if the Series 2023 Notes are still outstanding. Convertible into shares of the Company’s common stock at the discretion of the holder or by the Company based on the market price of the Company’s stock;
  
Exercise Price
  
$0.59, adjusted downward based on anti-dilution provisions/downround protection
    
$0.40, adjusted downward based on anti-dilution provisions/down-round protection;
  
Stated Interest
  
10% per annum through December 14, 2017, 3% per annum thereafter, due semiannually;
    
10% per annum through December 14, 2017, 3% per annum thereafter, due semiannually;
  
Derivative Liability
  
$2,055,000 established at inception due to the existence of down-round protection; revalued every quarter using Monte Carlo model
    
$9,212,285 established at inception due to existence of down-round protection; revalued every quarter using a Monte Carlo model
  
Convertible Debt [Table Text Block]
   
Series 2023 Notes
    
Series A Notes
    
Total
  
PIK Note Payable, Gross
   $
16,152,402
     $
26,909,716
     $
43,062,118
  
Less: Discount
    
(1,493,895
)
    
(5,555,254
)
    
(7,049,149
)
Less: Deferred Financing Cost
    
(211,518
)
    
(281,425
)
    
(492,943
)
PIK Note Payable, Net
   $
14,446,989
     $
21,073,037
     $
35,520,026
  
                         
PIK Note Derivative Liability
   $
876,063
     $
9,351,128
     $
10,227,191
  
   
Series 2023 Notes
    
Series A Notes
    
Total
  
PIK Note Payable, Gross
   $
16,090,721
     $
26,909,716
     $
43,000,437
  
Less: Discount
    
(1,538,299
)
    
(7,701,839
)
    
(9,240,138
)
Less: Deferred Financing Cost
    
(221,280
)
    
(294,414
)
    
(515,694
)
PIK Note Payable, Net
   $
14,331,142
     $
18,913,463
     $
33,244,605
  
                         
PIK Note Derivative Liability
   $
163,634
     $
1,883,630
     $
2,047,264