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Leases - Additional information (Details) - USD ($)
3 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Leases    
Weighted-average remaining lease term 4 years 3 months 18 days  
Weighted-average discount rate 8.00%  
Operating Lease, Payments $ 54,000 $ 0
Derecognition of Fairbanks warehouse lease (93,000)  
Operating Lease, Liability $ 93,006