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Note 4 - Facility Relocation (Tables)
3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Balance at March 31, 2018
  $
408
 
Facility relocation expense
   
17
 
Cash payments
   
(425
)
Balance at June 30, 2018
  $
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