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Note 16 - Restructuring (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Restructuring and Related Costs [Table Text Block]
   
Severance pay
   
Facility exit and
   
 
 
 
   
and benefits
   
Relocation costs
   
Total
 
Accrued restructuring balance at April 1, 2018
  $
262
    $
173
    $
435
 
Charges to operations
   
0
     
310
     
310
 
Cash payments
   
(97
)    
(483
)    
(580
)
Accrued restructuring balance at June 30, 2018
  $
165
    $
    $
165