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Note 6 - Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
December 31, 201
6
 
   
Fair Value Measurement Using
   
Asset
s at
 
   
Level 1
   
Level 2
   
Level 3
   
Fair Value
 
Derivative instrument
asset
  $
    $
172,888
    $
    $
172,888
 
Total
Assets
  $
    $
172,888
    $
    $
172,888
 
   
December 31, 201
5
 
   
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