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Note 4 - Facility Relocation (Tables)
6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Balance at March 31, 2017
  $
673
 
Facility relocation expense
   
622
 
Cash payments
   
(570
)
Balance at September
30, 2017
  $
725