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Inventories
6 Months Ended
Nov. 30, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIESInventories are stated at lower of cost and net realizable value (using the first-in, first-out method). Inventories consisted of the following:
(in thousands)Nov 30, 2021May 31, 2021
Raw materials$26,706 $22,925 
Work in process6,673 8,022 
Finished goods14,804 17,667 
Inventories$48,183 $48,614 
The Company periodically reviews inventory for both obsolescence and loss of value. The Company makes assumptions about the future demand for and market value of the inventory. Based on these assumptions, the Company estimates the amount of obsolete, expiring and slow-moving inventory. The total inventory reserve at November 30, 2021 and May 31, 2021 was $4.0 million and $3.8 million, respectively.