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Inventories
9 Months Ended
Feb. 28, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
Inventories 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, 2021May 31, 2020
Raw materials$21,237 $23,308 
Work in process8,508 8,318 
Finished goods19,261 28,279 
Inventories$49,006 $59,905 
The Company periodically reviews 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, 2021 and May 31, 2020 was $4.0 million and $4.7 million, respectively.