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Note 9 - Restructuring Charges (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
    As of December 31,
2018
  Charges/(Benefits)   Payment/Other   As of September 30,
2019
2019 Restructuring Program                                
Employee Severance   $
-
    $
2,854
    $
(1,834
)   $
1,020
 
Total   $
-
    $
2,854
    $
(1,834
)   $
1,020