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INVENTORIES
3 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
Inventories are stated at the lower of actual cost or net realizable value. Cost is determined by using the first in, first out (FIFO) method. Inventories consist of the following (in thousands):

June 30,
2018
 
March 31,
2018
Raw materials
$
21,094

 
$
20,860

Work in process
182

 
2,589

Finished goods
8,027

 
8,500

Deferred costs
3,436

 
2,825


$
32,739

 
$
34,774