Quarterly report [Sections 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, 2025
Aug. 31, 2024
May 31, 2025
Commitments and Contingencies.      
Operating lease costs $ 31,000 $ 32,000  
Right-of-use asset $ 98,000   $ 130,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent
Current operating lease liability $ 105,000   $ 141,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued Compensation And Non-financing Liabilities   Accrued Compensation And Non-financing Liabilities
Total operating lease liability $ 105,000   $ 141,000