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, 2022
Aug. 31, 2021
May 31, 2022
Commitments and Contingencies.      
Operating lease costs $ 46,000.0 $ 48,900  
Right of use asset $ 502,000   $ 536,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent
Current operating lease liability $ 135,000   $ 134,000
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 $ 387,000   $ 422,000
Total operating lease liability $ 522,000   $ 556,000