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Note 6 - Facility Relocation (Tables)
12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
   
March 31,
201
8
 
Beginning balance at March 31, 2017
  $
673
 
Facility relocation expense
   
842
 
Cash payments
   
(1,107
)
Ending balance at March 31, 2018
  $
408