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Note 15 - Fair Value Measurement (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
March 31, 2018
 
   
Fair Value Measurement Using
 
 
Assets (Liabilities)
 
   
Level 1
   
Level 2
   
Level 3
   
at Fair value
 
                                 
Derivative instrument asset
  $
-
    $
26,103
    $
-
    $
26,103
 
                                 
Derivative instrument liability
  $
-
    $
-
    $
-
    $
-
 
   
December 31, 2017
 
   
Fair Value Measurement Using
 
 
 
 
Assets (Liabilities)
 
   
Level 1
   
Level 2
   
Level 3
   
at Fair value
 
                                 
Derivative instrument asset
  $
-
    $
-
    $
-
    $
-
 
                                 
Derivative instrument liability
  $
-
    $
-
    $
-
    $
-