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Note 14 - Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
June 30, 2017
 
   
Fair Value Measurement Using
 
 
Assets (Liabilities)
 
   
Level 1
   
Level 2
   
Level 3
   
at Fair value
 
                                 
Derivative instrument asset
  $
-
    $
573,378
    $
-
    $
573,378
 
   
December 31, 2016
 
   
Fair Value Measurement Using
 
 
Assets (Liabilities)
 
   
Level 1
   
Level 2
   
Level 3
   
at Fair value
 
                                 
Derivative instrument asset
  $
-
    $
172,888
    $
-
    $
172,888