Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Summary of Operating Lease Balances (Details)

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Commitments and Contingencies - Summary of Operating Lease Balances (Details) - USD ($)
3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
May 31, 2023
Commitments and Contingencies.      
Operating lease costs $ 42,600 $ 46,000.0  
Right-of-use asset $ 366,000   $ 400,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent
Current operating lease liability $ 140,000   $ 139,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued Compensation And Non-financing Liabilities   Accrued Compensation And Non-financing Liabilities
Non-current operating lease liability $ 247,000   $ 283,000
Total operating lease liability $ 387,000   $ 422,000