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Note 7 - Fair Values of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

Risk-free interest rate

    0.60 %

Expected term

 

 

2.07 – 2.11  

Expected dividends

    0  

Volatility of stock price

    94.7% - 98.6 %
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Compensatory Warrant

       

Fair value at January 1, 2014

  $ 36,370  

Loss on derivative

    6,211  

Transfer to additional paid-in-capital

    (42,581

)

Value at September 30, 2014

    -  
         

Warrant issued under PI SPA

       

Fair value at January 1, 2014

    206,707  

Gain on derivative

    (123,380

)

Value at September 30, 2014

    83,327  

Balance, September 30, 2014

  $ 83,327