Schedule II-Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Uncollectible accounts - trade
Reserves:
Balance at Beginning of Year	$ 84
Charged to Cost and Expenses		$ 84
Deductions From Reserves	84
Balance at End of Year		84
Valuation allowance on deferred tax asset
Reserves:
Balance at Beginning of Year	2,190	1,363	$ 1,514
Charged to Cost and Expenses	(728)	827	(151)
Balance at End of Year	$ 1,462	$ 2,190	$ 1,363