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LEASES - Summary of lease cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2023
May 31, 2022
Operating lease cost:    
Operating lease expense $ 347 $ 328
Short-term lease expense 187 126
Sublease Income (103) (159)
Total operating lease cost 431 295
Finance lease expense:    
Interest on finance leases 773 50
Variable finance lease expense 3 0
Total finance lease cost 4,112 161
Total Lease Cost 4,543 456
Cost of Sales    
Finance lease expense:    
Amortization of ROU assets 554 85
Depreciation and Amortization Expense    
Finance lease expense:    
Amortization of ROU assets $ 2,782 $ 26