Leases (Assets And Liabilities Related To Operating Leases) (Details) $ in Thousands	May 31, 2020 USD ($)
Assets:
Operating lease right of use assets	$ 1,383
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Liabilities:
Current: Operating lease liabilities	$ 843
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Long-Term: Operating lease liabilities	$ 540
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Operating lease liabilities	$ 1,383
Weighted Average Remaining Lease Term: Operating leases (years)	2 years 7 months 6 days
Weighted Average Discount Rate: Operating leases	4.20%