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Note 3 - Convertible Debentures (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Aug. 31, 2015
Aug. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Nov. 16, 2015
Series A Warrant [Member]          
Warrant Expiration Period 5 years 182 days        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 22,058,823 22,058,823      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.68 $ 0.68      
Class of Warrant or Right, Outstanding 8,088,235 8,088,235 8,088,235    
Series B Warrant [Member]          
Warrant Expiration Period 1 year 180 days        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 12,132,353 12,132,353      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.68 $ 0.68      
Class of Warrant or Right, Outstanding 4,448,529 4,448,529 4,448,529    
Debentures [Member] | Subsequent Event [Member]          
Registration Payment Arrangement, Accrual Carrying Value         $ 220,000
Debentures [Member] | Series A Warrant [Member]          
Proceeds from Convertible Debt $ 3,385,000        
Debentures [Member] | Series B Warrant [Member]          
Proceeds from Convertible Debt $ 897,000        
Debentures [Member]          
Debt Instrument, Interest Rate During Period 0.00%        
Potential Proceed from Issuance of Convertible Debt   $ 15,000,000      
Gross Proceeds from Convertible Debt $ 5,500,000        
Debt Instrument, Convertible, Conversion Price $ 0.68 $ 0.68      
Debt Instrument, Term 30 years        
Debt Instrument, Debt Default, Percentage of Outstanding Principal Amount If Default Is Not Due to Failure to Receive Cirm Grant 130.00%        
Debt Instrument, Debt Default, Percentage of Outstanding Principal Amount If Default Is Due to Failure to Receive CIRM Grant 4.00%        
Registration Rights Agreement Failure to Pay Liquidated Damages Interest Rate 18.00%        
Registration Payment Arrangement, Gains and Losses     $ 880,000    
Proceeds from Convertible Debt $ 4,720,000        
Convertible Debt 0 $ 0      
Debt Instrument, Unamortized Discount 4,720,000 4,720,000      
Amortization of Debt Discount (Premium)     15,000    
Payment After Approval of Authorities [Member]          
Potential Proceed from Issuance of Convertible Debt 9,500,000        
Debentures, Beneficial Conversion Feature [Member]          
Proceeds from Convertible Debt 438,000        
Potential Proceed from Issuance of Convertible Debt   15,000      
Gross Proceeds from Convertible Debt   5,500,000      
Approval for Grant in Amount for Clinical Trial $ 10,000,000 $ 10,000,000      
Cashless Basis of Class of Warrant to Be Exercised, Weighted Average Price Percentage 90.00%        
Cashless Basis of Class of Warrant to be Exercised Per Share $ 0.10 $ 0.10      
Cashless Basis of Class of Warrant to Be Exercised, Number of Shares to Be Issued, Uplift Percentage 250.00%        
Registration Payment Arrangement, Gains and Losses     (880,000)    
Proceeds from Convertible Debt     4,720,000  
Convertible Debt     15,000    
Debt Instrument, Unamortized Discount     $ 4,707,000