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Note 3 - Inventories (Tables)
9 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
December 31, 2016
 
 
March 31,
2016
 
Raw materials
  $
10,430
    $
9,433
 
Work-in-process
   
683
     
337
 
Finished goods
   
3,867
     
4,941
 
Less: reserve
   
(402
)    
(694
)
    $
14,578
    $
14,017