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Inventory (Tables)
 12 Months Ended
Mar. 31, 2016
Inventory [Abstract]  
Schedule of Inventory
Non-core inventory, inventory unreturned, long-term core inventory, and long-term core inventory deposits are as follows at March 31:

  
2016
  
2015
 
Non-core inventory
      
Raw materials
 
$
17,394,000
  
$
18,836,000
 
Work-in-process
  
135,000
   
255,000
 
Finished goods
  
42,982,000
   
39,828,000
 
 
  
60,511,000
   
58,919,000
 
Less allowance for excess and obsolete inventory
  
(2,451,000
)
  
(2,090,000
)
         
Total
 
$
58,060,000
  
$
56,829,000
 
         
Inventory unreturned
 
$
10,520,000
  
$
7,833,000
 
Long-term core inventory
        
Used cores held at the Company's facilities
 
$
34,405,000
  
$
27,417,000
 
Used cores expected to be returned by customers
  
10,781,000
   
9,799,000
 
Remanufactured cores held in finished goods
  
24,489,000
   
21,557,000
 
Remanufactured cores held at customers' locations (1)
  
172,600,000
   
130,762,000
 
   
242,275,000
   
189,535,000
 
Less allowance for excess and obsolete inventory
  
(1,175,000
)
  
(585,000
)
         
Total
 
$
241,100,000
  
$
188,950,000
 
         
Long-term core inventory deposits (1)..
 
$
5,569,000
  
$
31,571,000
 
 
(1)During the year ended March 31, 2016, the Company completed the core buy-back program with one of its largest customers. As a result of the completion of this buy-back program and related long-term core inventory reconciliations, $25,805,000 from long-term core inventory deposits was transferred to Remanufactured Cores held at customers’ locations within long-term core inventory. At March 31, 2015, $26,002,000 of remanufactured cores in connection with this core buy-back program was included in long-term core inventory deposits.