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Note 10 - Fair Values of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
Risk-free interest rate
 
0.35
-
1.37%
Expected term
 
1.07
 –
4.98
Expected dividends
 
 
0
 
Volatility of stock price
 
84.4
-
115.9%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Warrant issued under PI SPA
       
Fair value at January 1, 2015
    43,227  
Gain on derivative
    (35,037
)
      8,190  
         
Warrant issued under September 2015 SPA
       
Fair value at January 1, 2015
    -  
Fair value at issuance     92,199  
Gain on derivative
    (7,191
)
      85,008  
         
Balance, September 30, 2015
  $ 93,198