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Note 8 - Convertible Debt (PIK Notes) (Details Textual)
1 Months Ended 3 Months Ended 6 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 ($)
Feb. 28, 2014
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
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
Dec. 31, 2013
$ / shares
Aug. 05, 2013
$ / shares
Debt Instrument, Unamortized Discount, Total                 $ 6,941,703 $ 6,941,703   $ 9,755,832 $ 15,143,123          
Accrued Liquidated Damages                           $ 9        
Paid-in-Kind Interest                   $ 770,815 $ 2,007,329 $ 4,817,557 $ 3,551,195          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                 24,813,373 24,813,373   18,813,373 3,744,623     461,340    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                 $ 0.15 $ 0.15   $ 0.14 $ 0.36     $ 1.15    
Series A PIK Note Derivative Liability [Member]                                    
Derivative Liability, Fair Value, Gross Liability, Total                 $ 8,000,101 $ 8,000,101   $ 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                 748,417 748,417   $ 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 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                                  
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            
Series A Notes [Member]                                    
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 0.40                                
Debt Instrument, Face Amount   $ 19,848,486                                
Debt Instrument, Interest Rate, Stated Percentage   10.00%                                
Series 2023 Notes [Member]                                    
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 0.59                                
Debt Instrument, Face Amount   $ 10,500,000                                
Debt Instrument, Interest Rate, Stated Percentage   10.00%                                
Payment in Kind (PIK) Note [Member]                                    
Proceeds from Convertible Debt                           $ 23,000,000        
Debt Instrument, Unamortized Discount, Total                 6,941,703 6,941,703   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   $ 0.90                       $ 0.90        
Debt Instrument, Face Amount   $ 19,848,486                                
Debt Instrument, Interest Rate, Stated Percentage 10.00% 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             5,488,161 5,488,161   7,701,839 13,421,225          
Debt Instrument, Increase, Accrued Interest $ 324,925                 304,977   2,797,836 2,243,003          
Amortization of Debt Issuance Costs and Discounts, Total                 80,142 2,239,656   5,808,294 2,549,433          
Convertible Notes Payable, Total                 21,458,096 21,458,096   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                                 $ 1.40 $ 0.59
Debt Instrument, Face Amount     $ 10,500,000                              
Debt Instrument, Interest Rate, Stated Percentage     10.00%                           10.00%  
Debt Instrument, Unamortized Discount, Total                 1,453,542 1,453,542   1,538,299 1,721,898          
Paid-in-Kind Interest $ 577,439       $ 738,728   $ 703,550 $ 577,439                    
Debt Instrument, Increase, Accrued Interest                 50,115 61,681   2,019,717 1,308,192          
Amortization of Debt Issuance Costs and Discounts, Total                       200,360 154,567          
Convertible Notes Payable, Total                 $ 14,497,104 $ 14,497,104   $ 16,090,721 $ 12,344,046          
Debt Instrument, Term     10 days