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Note 9 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
2018
 
   
Fair Value
   
Input Level
 
                 
Liabilities
 
 
 
 
 
 
 
 
Forward Contract
  $
1,993
     
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]
   
September 30, 2018
   
September 30, 2017
 
                 
Balance at beginning of year
  $
1,985
    $
2,683
 
                 
Cash Settlement
   
-
     
-
 
Forward Contract Adjustment
   
8
     
(614
)
                 
Balance at end of period
  $
1,993
    $
2,069