Schedule II-Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Uncollectible accounts - trade
Reserves:
Balance at Beginning of Year		$ 84
Charged to Cost and Expenses	$ 26		$ 84
Deductions From Reserves		84
Balance at End of Year	26		84
Valuation allowance on deferred tax assets
Reserves:
Balance at Beginning of Year	1,462	2,190	1,363
Charged to Cost and Expenses	$ (1,462)	(728)	827
Balance at End of Year		$ 1,462	$ 2,190