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Note 4 - Inventories (Tables)
9 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December
3
1
, 201
7
   
March 31,
201
7
 
Raw materials
  $
9,886
    $
10,815
 
Work-in-process
   
411
     
342
 
Finished goods
   
3,165
     
3,604
 
Less: reserve
   
(3,008
)    
(888
)
    $
10,454
    $
13,873