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Note 7 - Convertible Debt (PIK Notes) (Details Textual)
1 Months Ended 6 Months Ended 20 Months Ended 24 Months Ended 35 Months Ended
Jun. 24, 2016
USD ($)
$ / shares
shares
May 31, 2016
USD ($)
Nov. 03, 2014
USD ($)
$ / shares
Aug. 05, 2013
USD ($)
$ / shares
Feb. 29, 2016
USD ($)
Nov. 30, 2015
USD ($)
Aug. 31, 2015
USD ($)
May 31, 2015
USD ($)
Feb. 28, 2015
USD ($)
Aug. 31, 2014
USD ($)
Feb. 28, 2014
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member] | Result of Anti-Dilution Adjustments after Issuance of Series A Notes [Member]                                  
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 1.36                          
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member] | Result of Anti-Dilution Adjustment after Issuance of Equity Units [Member]                                  
Debt Instrument, Convertible, Conversion Price | $ / shares $ 1.28                                
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] | After Issuance of Equity Units [Member]                                  
Debt Instrument, Convertible, Number of Equity Instruments 8,203,125                                
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member] | Series 2023 PIK Note Derivative Liability [Member] | Fair Value, Inputs, Level 3 [Member]                                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)                               $ 1,824,671  
Payment in Kind (PIK) Note [Member] | Series 2023 Notes [Member]                                  
Debt Instrument, Term       10 years                          
Debt Instrument, Face Amount       $ 10,500,000               $ 13,400,958   $ 13,400,958   13,400,958 $ 12,762,816
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                       1,791,109   1,791,109   1,791,109 1,854,894
Paid-in-Kind Interest         $ 638,141   $ 607,753   $ 578,812 $ 551,250 $ 525,000            
Debt Instrument, Convertible, Number of Equity Instruments       7,500,000                          
Financial Instruments Subject to Mandatory Conversion Earliest Conversion       1 year                          
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] | Minimum [Member]                                  
Convertible Debt, Number of Written Days Notice     30 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] | 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] | Series A PIK Note Derivative Liability [Member] | Fair Value, Inputs, Level 3 [Member]                                  
Derivative Liability, Fair Value, Gross Liability                       3,626,505   3,626,505   3,626,505  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)                           5,585,780      
Payment in Kind (PIK) Note [Member] | Series A Notes [Member]                                  
Debt Instrument, Term     4 years                            
Proceeds from Convertible Debt     $ 12,500,000                            
Debt Instrument, Face Amount     $ 19,848,486                 22,977,103   22,977,103   22,977,103 21,882,955
Debt Instrument, Interest Rate, Stated Percentage     10.00%                            
Debt Instrument, Convertible, Conversion Price | $ / shares     $ 0.92                            
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 9,212,285                            
Debt Instrument, Unamortized Discount     $ 7,348,486                 14,841,648   14,841,648   14,841,648 15,717,991
Payment in Kind (PIK) Note [Member]                                  
Proceeds from Convertible Debt                             $ 23,000,000    
Debt Instrument, Face Amount                       36,378,061   36,378,061   36,378,061 34,645,771
Debt Instrument, Unamortized Discount                       16,632,757   16,632,757   16,632,757 17,572,885
Paid-in-Kind Interest   $ 1,094,148       $ 1,042,045   $ 992,424                  
Series A PIK Note Derivative Liability [Member] | Fair Value, Inputs, Level 3 [Member]                                  
Derivative Liability, Fair Value, Gross Liability                       3,626,505   3,626,505   3,626,505  
Series A PIK Note Derivative Liability [Member]                                  
Derivative Liability, Fair Value, Gross Liability                       3,626,505   3,626,505   3,626,505 4,876,093
Series 2023 PIK Note Derivative Liability [Member] | Fair Value, Inputs, Level 3 [Member]                                  
Derivative Liability, Fair Value, Gross Liability                       230,329   230,329   230,329  
Series 2023 PIK Note Derivative Liability [Member]                                  
Derivative Liability, Fair Value, Gross Liability                       230,329   230,329   230,329 262,764
Accrued Liquidated Damages                       167,841   167,841 $ 200,000 167,841  
Debt Instrument, Unamortized Discount                       16,632,757   $ 16,632,757   $ 16,632,757 $ 17,572,885
Paid-in-Kind Interest                       $ 1,732,289 $ 578,813        
Stock Issued During Period, Shares, New Issues | shares 10,933,333                                
Proceeds from Issuance or Sale of Equity $ 1,640,000