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Inventory
 9 Months Ended
Dec. 31, 2016
Inventory [Abstract]  
Inventory
5. Inventory

Inventory is comprised of the following:

  
December 31, 2016
  
March 31, 2016
 
Non-core inventory
      
Raw materials
 
$
23,074,000
  
$
17,394,000
 
Work-in-process
  
581,000
   
135,000
 
Finished goods
  
50,556,000
   
42,982,000
 
 
  
74,211,000
   
60,511,000
 
Less allowance for excess and obsolete inventory
  
(2,871,000
)
  
(2,451,000
)
Total
 
$
71,340,000
  
$
58,060,000
 
         
Inventory unreturned
 
$
5,098,000
  
$
10,520,000
 
Long-term core inventory
        
Used cores held at the Company's facilities
 
$
42,036,000
  
$
34,405,000
 
Used cores expected to be returned by customers
  
12,104,000
   
10,781,000
 
Remanufactured cores held in finished goods
  
25,671,000
   
24,489,000
 
Remanufactured cores held at customers' locations (1)
  
178,607,000
   
172,600,000
 
   
258,418,000
   
242,275,000
 
Less allowance for excess and obsolete inventory
  
(1,220,000
)
  
(1,175,000
)
Total
 
$
257,198,000
  
$
241,100,000
 
         
Long-term core inventory deposits
 
$
5,569,000
  
$
5,569,000
 

(1)
Remanufactured cores held at customers’ locations represent the core portion of the Company's customers’ finished goods at the Company's customers’ locations.