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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
May 11, 2016
Nov. 11, 2015
Oct. 29, 2015
Oct. 22, 2015
Sep. 23, 2015
Mar. 09, 2015
Jan. 29, 2015
Nov. 13, 2014
Nov. 13, 2014
Nov. 08, 2013
Oct. 25, 2013
Jun. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Convertible Preferred Stock [Member] | Series A-1 Shares [Member] | Maximum [Member]                                
Maximum Ownership as a Result of Conversion   9.99%                            
Convertible Preferred Stock [Member] | Series A-1 Shares [Member]                                
Preferred Stock, Shares Authorized                       100,000 100,000   100,000  
Preferred Stock, Par or Stated Value Per Share                       $ 0.0001 $ 0.0001   $ 0.0001  
Preferred Stock, Shares Outstanding                       90,000 90,000   90,000  
Preferred Stock, Shares Issued                       90,000 90,000   90,000  
Stock Issued During Period, Shares, New Issues   5,500 84,500 84,500                        
Share Price   $ 100 $ 100 $ 100                        
Proceeds from Issuance of Convertible Preferred Stock   $ 550,000 $ 8,450,000 $ 8,450,000                        
Initial Conversion Price   $ 0.30                            
Preferred Stock, Dividend Rate, Percentage   6.00%                            
Period Preceding the Dividend Payment Date   10 days                            
Liquidation Value Per Share   $ 100                            
Dividends Payable                       $ 135,000 $ 135,000      
Convertible Preferred Stock [Member] | Series B-1 Shares [Member] | Maximum [Member]                                
Maximum Ownership as a Result of Conversion   9.99%                            
Convertible Preferred Stock [Member] | Series B-1 Shares [Member]                                
Preferred Stock, Shares Authorized                       105,000 105,000   105,000  
Preferred Stock, Par or Stated Value Per Share                       $ 0.0001 $ 0.0001   $ 0.0001  
Preferred Stock, Shares Outstanding                       105,000 105,000   105,000  
Preferred Stock, Shares Issued                       105,000 105,000   105,000  
Stock Issued During Period, Shares, New Issues   105,000                            
Share Price   $ 100                            
Proceeds from Issuance of Convertible Preferred Stock   $ 10,500,000                            
Initial Conversion Price   $ 0.30                            
Preferred Stock, Dividend Rate, Percentage   2.50%                            
Period Preceding the Dividend Payment Date   10 days                            
Liquidation Value Per Share   $ 100                            
Dividends Payable                       $ 65,625 $ 65,625      
Common Stock [Member] | Issued Lieu of Compensation [Member] | Director [Member]                                
Stock Issued During Period, Shares, New Issues 41,174                              
Stock Issued During Period, Value, New Issues $ 6,999                              
Common Stock [Member] | Issued Lieu of Compensation [Member] | Chief Executive Officer [Member]                                
Stock Issued During Period, Shares, New Issues 100,000                              
Stock Issued During Period, Value, New Issues $ 17,000                              
Common Stock [Member] | Private Investor SPA [Member]                                
Stock Issued During Period, Shares, New Issues               7,974,999   12,323,668 12,323,668          
Warrant [Member] | Private Investor SPA [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                   12,323,668 12,323,668          
Warrant [Member] | Fair Value, Inputs, Level 3 [Member]                                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3           $ 98,065                    
Fair Value Assumptions, Risk Free Interest Rate           1.66%                    
Fair Value Assumptions, Expected Term           5 years                    
Fair Value Assumptions, Expected Dividend Rate           0.00%                    
Fair Value Assumptions, Expected Volatility Rate           115.70%                    
Private Investor SPA [Member]                                
Stock Issued During Period, Value, New Issues                   $ 3,697,100 $ 3,697,100          
Placement Agent Warrants [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                   985,893            
Commissions and Fees, Percent of Gross Proceeds                   8.00%            
Private Investor SPA [Member]                                
Stock Issued During Period, Shares, New Issues             13,956,250     12,323,668 12,323,668          
Stock Issued During Period, Value, New Issues               $ 1,595,000                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights               11,962,501 11,962,501              
Class of Warrant or Right, Exercise Price of Warrants or Rights               $ 0.30 $ 0.30   $ 0.30 $ 0.20 $ 0.20 $ 0.20 $ 0.20  
Term Of Warrant                 5 years              
New Employees [Member] | The 2015 Equity Incentive Plan [Member] | Stock Compensation Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                         4 years 182 days      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                         1.12%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate                         0.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                         93.70%      
New Employees [Member] | The 2015 Equity Incentive Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                       75,000 75,000      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                         7 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                         3 years      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                         $ 0.17      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value                         $ 0.115      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value Amount                         $ 8,644      
Fair Value, Inputs, Level 3 [Member] | Warrants Issued Under PISPA [Member]                                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances                   $ 325,891            
Warrants Issued Under PISPA [Member]                                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value                             $ 7,478  
Warrants Issued Under PISPA [Member]                                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances                         7,478      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings                       $ (433) 1,904      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value                       5,574 5,574      
Promissory Note [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         833,333                      
September 2015 Warrants [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 0.30                      
Term Of Warrant         5 years                      
Debt Instrument, Unamortized Discount         $ 92,199                      
Fair Value Adjustment of Warrants                       $ (49,035) $ (51,410)      
Warrants and Rights Outstanding                           $ 148,216 96,806  
Preferred Stock, Shares Authorized                       5,000,000 5,000,000      
Preferred Stock, Par or Stated Value Per Share                       $ 0.0001 $ 0.0001      
Dividends Payable                       $ 200,625 $ 200,625    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           575,000                    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value                       153,790 153,790      
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 0.21                    
Class of Warrant or Right, Vesting Term           1 year                    
Derivative Liability                           $ 0 0  
Class of Warrant or Right, Nonemployee Compensation Expense                       11,625 11,625      
Warrants and Rights Outstanding                       $ 153,790 $ 153,790   $ 104,284