Leases - Lease liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 38	$ 50
Variable lease costs	35	34
Total lease expense	$ 73	$ 84
Office Space
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Existence of Option to Extend [true false]	false