Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Aug. 31, 2013	Sep. 01, 2012	Dec. 01, 2012
Property and Equipment
Property and Equipment, gross	$ 16,001		$ 16,155
Accumulated depreciation	(13,981)		(14,030)
Property and Equipment, net	2,020		2,125
New capital lease obligations incurred	48	54
Land
Property and Equipment
Property and Equipment, gross	437		437
Land improvements
Property and Equipment
Property and Equipment, gross	1,561		1,561
Land improvements | Minimum
Property and Equipment
Estimated Useful Lives	10 years
Land improvements | Maximum
Property and Equipment
Estimated Useful Lives	20 years
Buildings and improvements
Property and Equipment
Property and Equipment, gross	1,865		1,857
Buildings and improvements | Minimum
Property and Equipment
Estimated Useful Lives	10 years
Buildings and improvements | Maximum
Property and Equipment
Estimated Useful Lives	40 years
Machinery and equipment
Property and Equipment
Property and Equipment, gross	$ 12,138		$ 12,300
Machinery and equipment | Minimum
Property and Equipment
Estimated Useful Lives	3 years
Machinery and equipment | Maximum
Property and Equipment
Estimated Useful Lives	20 years