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Property, Plant and Equipment, Net
 12 Months Ended
May 31, 2023
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, NET PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment are summarized as follows:
(in thousands)May 31, 2023May 31, 2022
Building and building improvements$29,660 $29,425 
Computer software and equipment27,435 27,292 
Machinery and equipment17,023 15,453 
Placement and evaluation units26,355 21,009 
Construction in progress2,444 2,402 
102,917 95,581 
Less accumulated depreciation(59,026)(51,069)
43,891 44,512 
Land and land improvements493 493 
$44,384 $45,005 
Depreciation expense for fiscal years 2023, 2022 and 2021 was $11.9 million, $7.6 million and $5.7 million, respectively.