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Contract Assets (Tables)
 6 Months Ended
Sep. 30, 2025
Contract Assets [Abstract]  
Contract Assets
Contract assets are comprised of the following:
 
         
     September 30, 2025      March 31, 2025  
Short-term contract assets
         
Cores expected to be returned by customers
 $17,554,000   $17,732,000 
Core premiums paid to customers
  10,449,000    9,669,000 
Upfront payments to customers
  1,300,000    1,400,000 
Finished goods premiums paid to customers
  1,003,000    805,000 
Total short-term contract assets
 $30,306,000   $29,606,000 
           
Long-term contract assets
         
Remanufactured cores held at customers' locations
 $301,259,000   $301,388,000 
Core premiums paid to customers
  25,892,000    24,714,000 
Long-term core inventory deposits
   -     5,569,000 
Finished goods premiums paid to customers
  2,697,000    2,483,000 
Upfront payments to customers
  1,496,000    2,114,000 
Total long-term contract assets
 $331,344,000   $336,268,000