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 6 Months Ended
Nov. 30, 2022
Nov. 30, 2021
Nov. 30, 2022
Nov. 30, 2021
May 31, 2022
Commitments and Contingencies.          
Operating lease costs $ 46,400 $ 48,900 $ 100,000 $ 100,000  
Right of use asset $ 468,000   $ 468,000   $ 536,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent   Other Assets, Noncurrent
Current operating lease liability $ 136,000   $ 136,000   $ 134,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued Compensation And Non-financing Liabilities   Accrued Compensation And Non-financing Liabilities   Accrued Compensation And Non-financing Liabilities
Non-current operating lease liability $ 353,000   $ 353,000   $ 422,000
Total operating lease liability $ 489,000   $ 489,000   $ 556,000