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Note 7 - Restructuring Charges (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   

Three Months Ended June 30,

   

Six Months Ended June 30,

 
   

2020

   

2019

   

2020

   

2019

 

Beginning balance

  $     $ 91     $     $ 244  

Restructuring charges

                      92  

Cash payments

          (91 )           (336 )

Ending balance

  $     $     $     $