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Note 7 - Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

December 31, 2015

 
   

Fair Value Measurement Using

   

Liabilities at

 
   

Level 1

   

Level 2

   

Level 3

   

Fair Value

 

Derivative instrument liability

  $     $ 2,027,086     $     $ 2,027,086  

Total Liabilities

  $     $ 2,027,086     $     $ 2,027,086  
   

December 31, 2014

 
   

Fair Value Measurement Using

   

Liabilities at

 
   

Level 1

   

Level 2

   

Level 3

   

Fair Value

 

Derivative instrument liability

  $     $ 1,115,805     $     $ 1,115,805  

Total Liabilities

  $     $ 1,115,805     $     $ 1,115,805