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

Risk-free interest rate

 

0.60%

 

Expected term

2.32

 2.36

Expected dividends

  0  

Volatility of stock price

114.5%

114.7%

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 June 30, 2014

    -  
         

Warrant issued under PI SPA

       

Fair value at January 1, 2014

    206,707  

Loss on derivative

    100,512  

Value at June 30, 2014

    307,219  

Balance, June 30, 2014

  $ 307,219