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Note 12 - Restructuring Charges (Tables)
12 Months Ended
Dec. 31, 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
December 31, 2019
2019 Restructuring Program                                
Employee Severance   $
-
    $
2,854
    $
(2,854
)   $
-
 
Total   $
-
    $
2,854
    $
(2,854
)   $
-