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Note 8 - Convertible Debt (PIK Notes) (Details Textual)
1 Months Ended 12 Months Ended 24 Months Ended
Dec. 14, 2017
USD ($)
$ / shares
shares
Nov. 03, 2014
USD ($)
$ / shares
Aug. 01, 2013
USD ($)
Nov. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
May 31, 2017
USD ($)
Feb. 28, 2017
USD ($)
Feb. 28, 2014
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 15, 2017
Dec. 31, 2015
$ / shares
shares
Aug. 05, 2013
$ / shares
Debt Instrument, Unamortized Discount, Total                 $ 9,755,832 $ 15,143,123        
Accrued Liquidated Damages                     $ 9      
Paid-in-Kind Interest                 $ 4,817,557 $ 3,551,195        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                 18,813,373 3,744,623     461,340  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                 $ 0.14 $ 0.36     $ 1.15  
Series A PIK Note Derivative Liability [Member]                            
Derivative Liability, Fair Value, Gross Liability, Total                 $ 1,883,630 $ 2,033,643        
Series 2023 PIK Note Derivative Liability [Member]                            
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 2,055,000                      
Derivative Liability, Fair Value, Gross Liability, Total                 $ 163,634 142,909        
Financial Instruments Subject to Mandatory Conversion Earliest Conversion     1 year                      
Financial Instrument Subject to Mandatory Conversion Period for Calculation of Conversion Feature     10 days                      
Warrants Issued to Series 2023 Notes Holders [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 298,420               3,720,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                 $ 0.10          
Warrants and Rights Outstanding                 $ 224,290          
Warrants Issued to Series A Notes Holders [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 6,280,000,000,000                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 0.10                          
Payment in Kind (PIK) Note [Member]                            
Proceeds from Convertible Debt                     $ 23,000,000      
Debt Instrument, Face Amount                 43,000,437 38,196,966        
Debt Instrument, Unamortized Discount, Total                 9,240,138 15,143,123        
Paid-in-Kind Interest       $ 1,266,613   $ 1,206,289                
Convertible Notes Payable, Total                 33,244,605 23,040,093        
Payment in Kind (PIK) Note [Member] | Series A Notes [Member]                            
Proceeds from Convertible Debt   $ 12,500,000                        
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 0.40                 $ 0.90      
Debt Instrument, Face Amount   $ 19,848,486             26,909,716 24,125,958        
Debt Instrument, Interest Rate, Stated Percentage 10.00% 10.00%                   3.00%    
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 9,212,285                        
Debt Instrument, Unamortized Discount, Difference Between Cash Received and Principal   7,348,486                        
Debt Instrument, Unamortized Discount, Total   $ 16,560,771             7,701,839 13,421,225        
Debt Instrument, Increase, Accrued Interest $ 324,925               2,797,836 2,243,003        
Amortization of Debt Issuance Costs and Discounts, Total                 5,808,294 2,549,433        
Convertible Notes Payable, Total                 26,909,721 10,696,047        
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   30                        
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   10                        
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 2023 Notes [Member]                            
Debt Instrument, Convertible, Conversion Price | $ / shares                           $ 0.59
Debt Instrument, Face Amount     $ 10,500,000           16,090,721 14,071,008        
Debt Instrument, Interest Rate, Stated Percentage     10.00%                      
Debt Instrument, Unamortized Discount, Total                 1,538,299 1,721,898        
Paid-in-Kind Interest         $ 738,728   $ 703,550 $ 577,439            
Debt Instrument, Increase, Accrued Interest                 2,019,717 1,308,192        
Amortization of Debt Issuance Costs and Discounts, Total                 200,360 154,567        
Convertible Notes Payable, Total                 $ 16,090,721 $ 12,344,046        
Debt Instrument, Term     10 days