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Note 16 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
2018
 
   
Fair Value
   
Input Level
 
                 
Liabilities
 
 
 
 
 
 
 
 
Forward Contract
  $
1,793
     
3
 
   
2017
 
   
Fair Value
   
Input Level
 
                 
Liabilities
 
 
 
 
 
 
 
 
Forward Contract
  $
1,985
     
3
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
2018
   
2017
   
2016
 
                         
Balance at beginning of year
  $
1,985
    $
2,683
    $
4,000
 
Cash Settlement
   
-
     
-
     
2,200
 
Forward Contract Adjustment
   
(192
)    
(698
)    
883
 
Balance at end of year
  $
1,793
    $
1,985
    $
2,683