Note 9 - Patent Rights (Tables)
|12 Months Ended|
Nov. 30, 2021
|Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]||
Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef