Financial Instruments (Details 2) $ in Thousands	Nov. 30, 2019 USD ($)
Amortized Cost
Due within one year	$ 835
Due after one year through five years	8,581
Due after five years through 10 years	2,259
Due after 10 years through 15 years	0
Due beyond 15 years	75
Total	11,750
Estimated Fair Value
Due within one year	837
Due after one year through five years	8,710
Due after five years through 10 years	2,262
Due after 10 years through 15 years	0
Due beyond 15 years	75
Total	$ 11,884