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Inventories
 9 Months Ended
Feb. 28, 2023
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)Feb 28, 2023May 31, 2022
Raw materials$34,471 $28,251 
Work in process7,924 7,186 
Finished goods21,137 15,955 
Inventories$63,532 $51,392 
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 February 28, 2023 and May 31, 2022 was $3.1 million and $3.7 million, respectively.