Schedule II-Valuation and Qualifying Accounts and Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
Uncollectible accounts - trade
Reserves:
Balance at Beginning of Year	$ 134		$ 131
Charged to Cost and Expenses	(101)	37	26
Charged to Other Accounts		13	21
Deductions From Reserves	33	44	50
Balance at End of Year		134	128
Inventories
Reserves:
Balance at Beginning of Year	10,854		1,242
Charged to Cost and Expenses		10,900	380
Charged to Other Accounts		11	55
Deductions From Reserves	10,854	489	1,245
Balance at End of Year		10,854	432
Valuation allowance on deferred tax assets
Reserves:
Balance at Beginning of Year	379		290
Charged to Cost and Expenses	16	60	29
Balance at End of Year	$ 395	$ 379	$ 319