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Note 10 - Fair Values of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
Risk-free interest rate
  0.20 - 0.21%  
Expected term
  0.07 - 0.11  
Expected dividends
    0    
Volatility of stock price
  62.9 - 69.0%  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Warrant issued under PI SPA
       
Fair value at January 1, 2016
  7,478  
Gain on derivative
    (6,272
)
      1,206  
         
Warrant issued under September 2015 SPA
       
Fair value at January 1, 2016
    96,806  
Gain on derivative
    (4,607
Transfer to additional paid-in capital     (92,199 )
      -  
         
Balance, September 30, 2016
  $ 1,206