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Note 4 - Debt Obligations (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 13, 2017
USD ($)
shares
Dec. 30, 2016
USD ($)
$ / shares
shares
Dec. 27, 2016
USD ($)
$ / shares
shares
Sep. 17, 2016
USD ($)
$ / shares
shares
Jul. 08, 2016
USD ($)
$ / shares
shares
Jun. 06, 2016
USD ($)
shares
Jan. 15, 2015
USD ($)
Nov. 19, 2013
USD ($)
Jan. 31, 2015
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Apr. 30, 2017
$ / shares
Dec. 28, 2016
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Interest Expense, Debt                   $ 953,636 $ 406,325 $ 3,129,104 $ 994,671      
Share Price | $ / shares   $ 0.83 $ 0.86 $ 0.70                   $ 0.51    
Debt Instrument, Convertible, Conversion Price | $ / shares                               $ 0.25
Debt Conversion, Original Debt, Amount                   141,763 $ 206,934          
Proceeds from Long-term Lines of Credit               $ 50,000                
Line of Credit Facility, Interest Rate at Period End               24.00%                
Line of Credit Facility, Canceled                               $ 58,530
Derivative Liability, Current                   397,960   663,560      
Proceeds from Lines of Credit           $ 300,000           300,000      
Line of Credit Facility, Interest Rate During Period           18.00%                    
Line of Credit, Current                   50,000   $ 50,000      
Long-term Debt, Gross                   $ 5,760,668            
Conversion of Line of Credit to 2015 Unit Offering [Member]                                
Debt Conversion, Original Debt, Amount       $ 250,000                        
Debt Conversion, Original Debt, Accrued Interest Amount       $ 33,571                        
Line of Credit [Member]                                
Debt Instrument, Term           270 days                    
Summer 2014 Offering Conversions [Member]                                
Common Stock, Cancelled | shares                         530,000      
Common Stock, Cancelled Value                         $ 212,000      
Winter 2016 Unit Offering [Member]                                
Debt Instrument, Interest Rate, Stated Percentage     12.00%                          
Debt Instrument, Convertible, Conversion Price | $ / shares     $ 0.57                          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 0.70                       $ 0.70  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                   512,281   292,983     292,983  
Units Issued During Period, Value, New Issues     $ 600,000                          
Number of Trading Days Prior to Interest Payment Due Date if Paid by Issuance of Common Stock     20 days                          
Debt Conversion before Maturity, Number of Trading Days Common Stock Closes at or above 3 Times the Unit Price     10 days                          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares     1                          
Class of Warrant or Right, Exercise Period     30 days                          
Class of Warrant or Right, Exercise Period Condition, Number of Trading Days Common Stock Closes at or above 2 Times the Exercise Price     10 days                          
Proceeds from Issuance of Units                   $ 292,000   $ 167,000        
December/January Notes [Member]                                
Proceeds from Convertible Debt                 $ 133,000       $ 333,000      
Debt Instrument, Interest Rate, Stated Percentage                 12.00%              
Debt Instrument, Convertible, Conversion Price | $ / shares                         $ 0.25      
Debt Conversion, Original Debt, Amount                         $ 383,913      
One Year Convertible Notes [Member]                                
Proceeds from Convertible Debt   $ 250,000     $ 250,000                      
Debt Instrument, Interest Rate, Stated Percentage   3.00%     3.00%                      
Debt Instrument, Face Amount   $ 280,000     $ 280,000                      
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 0.57     $ 0.45                      
Debt Conversion, Original Debt, Amount $ 280,000                              
Debt Conversion, Converted Instrument, Shares Issued | shares 640,889                              
Debt Instrument, Unamortized Discount   $ 280,000                            
Convertible Notes Maturing on September 17, 2019 [Member]                                
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 0.55                        
Long-term Debt, Gross       $ 283,571                        
Series A Warrant [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                     $ 0.45          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                     728,571 5,429,872 9,597,123      
Warrant Issued in Exchange of December/January Notes [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                 $ 0.30       $ 0.40      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                         1,909,301      
Series A Warrant Issued for Exchanged Equity [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                               $ 0.40
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                               234,120
Warrants Issued Concurrently With One Year Convertible Note [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.75     $ 0.65                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares   400,000     400,000                      
Class of Warrant or Right, Expiration Term   5 years     5 years                      
Derivative Liability, Current   $ 331,760     $ 160,000         $ 397,960   $ 331,800        
Debt Instrument, Unamortized Discount         $ 120,000                      
Increase (Decrease) in Derivative Liabilities                       $ 171,800        
Warrants Issued Concurrently with Line of Credit [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                       $ 0.35        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                       300,000        
Debt Instrument, Unamortized Discount                       $ 237,405        
Class of Warrant or Right, Number of Warrants Per Each Dollar Invested | shares           1                    
Warrant Issued in Exchange of Cancelled Line of Credit [Member]                                
Debt Conversion, Original Debt, Amount                       $ 283,571        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 0.70               $ 0.70        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares       515,583               515,583        
The 2015 Unit Offering [Member]                                
Minimum Proceeds Required For Stock Registration             $ 3,000,000                  
Proceeds from Convertible Debt                     $ 255,000 $ 2,140,000 $ 2,671,713      
Debt Instrument, Interest Rate, Stated Percentage                     12.00% 12.00% 12.00%      
Debt Conversion, Original Debt, Amount                       $ 589,371        
Debt Conversion, Converted Instrument, Shares Issued | shares                       2,167,420        
Convertible Notes Payable                       $ 4,140,213        
The 2015 Unit Offering [Member] | Debt Instrument, Convertible, Unit Price 1 [Member]                                
Debt Instrument, Face Amount                       $ 985,000 $ 1,535,000      
Debt Instrument, Convertible, Conversion Price | $ / shares                       $ 0.35 $ 0.25      
The 2015 Unit Offering [Member] | Debt Instrument, Convertible, Unit Price 2 [Member]                                
Debt Instrument, Face Amount                       $ 1,155,000        
Debt Instrument, Convertible, Conversion Price | $ / shares                       $ 0.55        
The 2015 Unit Offering [Member] | Debt Instrument, Convertible, Units Price 2 [Member]                                
Debt Instrument, Face Amount                         $ 1,136,713      
Debt Instrument, Convertible, Conversion Price | $ / shares                         $ 0.35      
The 2015 Unit Offering [Member] | New Convertible Promissory Note in Exchange of Cancelled Common Stock [Member]                                
Debt Instrument, Face Amount                         $ 212,000      
The 2015 Unit Offering [Member] | Series A Warrant [Member]                                
Class of Warrant or Right, Call Provision, Stock Price Threshold, Consecutive Business Days             10 days                  
Warrant, Convertible Conversion Ratio             2