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Note 9 - Fair Values of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

Risk-free interest rate

     0.40 %  

–

       0.42 %

Expected term

     1.32    

–

       1.36  

Expected dividends

             0          

Volatility of stock price

     78.5 %  

–

       78.9 %
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

     (14,253

)

Balance, June 30, 2015

   $ 28,974