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Note 8 - Convertible Debt (PIK Notes) (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Nov. 03, 2014
USD ($)
$ / shares
Aug. 05, 2013
USD ($)
$ / shares
Nov. 30, 2015
USD ($)
Aug. 31, 2015
USD ($)
May. 31, 2015
USD ($)
Feb. 28, 2015
USD ($)
Nov. 30, 2014
USD ($)
Aug. 31, 2014
USD ($)
Feb. 28, 2014
USD ($)
Aug. 31, 2013
USD ($)
Jun. 30, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member] | Result of Anti-Dilution Adjustment [Member]                              
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 1.36                          
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member] | After Series A Notes Issuance [Member]                              
Debt Instrument, Convertible, Number of Equity Instruments   7,720,588                          
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member] | Additional Discount from February and August 2015 Issuance [Member]                              
Debt Instrument, Unamortized Discount                       $ 36,665      
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member]                              
Debt Instrument, Term   10 years                          
Proceeds from Convertible Debt   $ 10,500,000                          
Debt Instrument, Face Amount   $ 10,500,000                   12,762,816 $ 11,576,250   $ 11,576,250
Debt Instrument, Interest Rate, Stated Percentage   10.00%                          
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 1.40                          
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 2,055,000                          
Debt Instrument, Unamortized Discount                       1,854,894 1,949,555   1,949,555
Paid-in-Kind Interest       $ 607,753   $ 578,813   $ 551,250 $ 525,000            
Derivative Liability                       262,764 478,149   478,149
Amortization of Debt Discount (Premium)                       131,326      
Convertible Notes Payable                       10,907,922 9,626,695   9,626,695
Debt Instrument, Convertible, Number of Equity Instruments   7,500,000                          
Financial Instruments Subject to Mandatory Conversion Earliest Conversion   1 year                          
Financial Instrument Subject to Mandatory Conversion Period for Calculation of Conversion Feature   10 days                          
Payment in Kind (PIK) Note [Member] | Series A Notes [Member] | Minimum [Member]                              
Convertible Debt, Number of Written Days Notice 30 days                            
Payment in Kind (PIK) Note [Member] | Series A Notes [Member] | Maximum [Member]                              
Convertible Debt, Number of Written Days Notice 90 days                            
Payment in Kind (PIK) Note [Member] | Series A Notes [Member] | Result of Extension Option [Member]                              
Debt Instrument, Convertible, Conversion Price | $ / shares $ 0.10                            
Payment in Kind (PIK) Note [Member] | Series A Notes [Member] | Mandatory Conversion of Note if Condition 1 Exists [Member]                              
Debt Instrument, Convertible, Threshold Consecutive Trading Days 10 days                            
Debt Instrument, Convertible, Stock Price Trigger | $ / shares $ 1                            
Payment in Kind (PIK) Note [Member] | Series A Notes [Member] | Mandatory Conversion of Note if Condition 2 Exists [Member]                              
Debt Instrument, Convertible, Threshold Consecutive Trading Days 20 days                            
Debt Instrument, Convertible, Stock Price Trigger | $ / shares $ 1.40                            
Payment in Kind (PIK) Note [Member] | Series A Notes [Member] | Specified Event [Member]                              
Debt Instrument, Interest Rate, Stated Percentage 1.00%                            
Payment in Kind (PIK) Note [Member] | Series A Notes [Member] | Combined Discount [Member]                              
Debt Instrument, Unamortized Discount $ 16,560,771                            
Payment in Kind (PIK) Note [Member] | Series A Notes [Member]                              
Debt Instrument, Term 4 years                            
Proceeds from Convertible Debt $ 12,500,000           $ 12,500,000                
Debt Instrument, Face Amount $ 19,848,486                     $ 21,882,955 19,848,486   19,848,486
Debt Instrument, Interest Rate, Stated Percentage 10.00%                            
Debt Instrument, Convertible, Conversion Price | $ / shares $ 0.92                     $ 1.36      
Shares Issued For Liquidated Damages, Shares | shares                     1,015,086        
Shares Issued For Liquidated Damages                     $ 741,011        
Debt Instrument, Convertible, Beneficial Conversion Feature $ 9,212,285                            
Debt Instrument, Unamortized Discount $ 7,348,486                     $ 15,717,991 16,450,742   16,450,742
Derivative Liability                       4,876,093 9,557,476   9,557,476
Amortization of Debt Discount (Premium)                       732,751      
Interest Payable                       2,034,469      
Convertible Notes Payable                       6,164,964 3,397,744   $ 3,397,744
Payment in Kind (PIK) Note [Member] | Minimum [Member]                              
Debt Instrument, Convertible, Remaining Discount Amortization Period                             2 years
Payment in Kind (PIK) Note [Member]                              
Proceeds from Convertible Debt                             $ 23,000,000
Debt Instrument, Face Amount                       34,645,771 31,424,736   31,424,736
Debt Instrument, Unamortized Discount                       17,572,885 18,400,297   18,400,297
Paid-in-Kind Interest     $ 1,042,045   $ 992,424                    
Derivative Liability                       5,138,857 10,035,625   10,035,625
Convertible Notes Payable                       $ 17,072,886 13,024,439   13,024,439
Proceeds from Convertible Debt                   $ 10,500,000   12,499,998 $ 10,500,000  
Accrued Liquidated Damages                       $ 541,011 200,000   200,000
Shares Issued For Liquidated Damages                       741,011      
Debt Instrument, Unamortized Discount                       17,572,885 18,400,297   18,400,297
Paid-in-Kind Interest                       3,221,035 1,076,250  
Derivative Liability                       $ 5,138,857 $ 10,035,625 $ 0 $ 10,035,625