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Note 16 - Restructuring (Tables)
6 Months Ended
Sep. 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
   
     
403
     
403
 
Cash payments
   
(173
)    
(576
)    
(749
)
Accrued restructuring balance at September 30, 2018
  $
89
    $
    $
89