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Note 10 - Fair Values of Financial Instruments
9 Months Ended
Sep. 30, 2015
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
10.
FAIR VALUES OF FINANCIAL INSTRUMENTS
 
Cash and cash equivalents, accounts and notes receivable, accounts payable, accrued liabilities, and notes payable, are carried at, or approximate, fair value because of their short-term nature.
 
The fair value of the warrant liabilities at September 30, 2015 were measured using the following assumptions:
 
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%
 
The warrant liabilities are considered Level 3 liabilities on the fair value hierarchy as the determination of fair value includes various assumptions about of future activities and the Company’s stock prices and historical volatility as inputs.
 
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