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Note 8 - Fair Values of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

Risk-free interest rate

    0.21 %

Expected term

 1.57  - 1.61  

Expected dividends

    0  

Volatility of stock price

78.2 % - 78.7 %
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

    (14,659
         

Balance, March 31, 2015

  $ 28,568