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Note 3 - Inventories (Tables)
3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30, 2018
   
March 31,
2018
 
Raw materials
  $
8,642
    $
9,059
 
Work-in-process
   
479
     
380
 
Finished goods
   
2,940
     
3,152
 
Less: reserve
   
(3,429
)    
(3,363
)
Inventories, net
  $
8,632
    $
9,228