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Inventory (Tables)
 3 Months Ended
Jun. 30, 2017
Inventory [Abstract]  
Schedule of inventory
Inventory is comprised of the following:

  
June 30, 2017
  
March 31, 2017
 
Non-core inventory
      
Raw materials
 
$
22,537,000
  
$
21,515,000
 
Work-in-process
  
673,000
   
641,000
 
Finished goods
  
62,124,000
   
48,337,000
 
   
85,334,000
   
70,493,000
 
Less allowance for excess and obsolete inventory
  
(3,088,000
)
  
(2,977,000
)
Total
 
$
82,246,000
  
$
67,516,000
 
         
Inventory unreturned
 
$
7,701,000
  
$
7,581,000
 
Long-term core inventory
        
Used cores held at the Company's facilities
 
$
35,325,000
  
$
38,713,000
 
Used cores expected to be returned by customers
  
11,590,000
   
11,752,000
 
Remanufactured cores held in finished goods
  
33,981,000
   
27,667,000
 
Remanufactured cores held at customers' locations (1)
  
185,426,000
   
185,938,000
 
   
266,322,000
   
264,070,000
 
Less allowance for excess and obsolete inventory
  
(1,596,000
)
  
(1,148,000
)
Total
 
$
264,726,000
  
$
262,922,000
 
         
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.