Leases - Lessee (Details)		12 Months Ended
	Oct. 01, 2016 ft²	Nov. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)	Nov. 30, 2018 USD ($)	Dec. 01, 2019 USD ($)
Operating leases assets and liabilities
Operating Lease, Right-of-Use Asset		$ 716,000			$ 858,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]					Other Assets.
Operating Lease, Liability		$ 748,000			$ 858,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]		Operating Lease, Liability			Other Liabilities.
Lessee, Operating Sublease, Description [Abstract]
Term of sublease	10 years
Area of subleased property | ft²	1,920
Lease terms
Discount rate		3.50%
Rental expense		$ 159,000	$ 146,000
Rental expense				$ 149,000
Weighted-average remaining lease term		5 years 10 months 24 days