Schedule III-Real Estate and Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified								12 Months Ended													12 Months Ended					12 Months Ended										12 Months Ended		12 Months Ended
	Nov. 30, 2013	Dec. 01, 2012	Dec. 03, 2011	Nov. 27, 2010	Nov. 30, 2013 Undeveloped Land	Nov. 30, 2013 Buildings included as collateral Buildings - Locations 15 and 17-23 Revolving line of credit	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Undeveloped portion	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 1 item	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 2	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 3	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 4	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 5	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 6	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 7	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 8	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 9	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 10	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 11	Nov. 30, 2013 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 12	Nov. 30, 2013 Griffin Center, Windsor, CT Undeveloped portion	Nov. 30, 2013 Griffin Center, Windsor, CT Flex Building Location 13	Nov. 30, 2013 Griffin Center, Windsor, CT Restaurant Building Location 14	Nov. 30, 2013 Griffin Center, Windsor, CT Office building(s) Location 15	Nov. 30, 2013 Griffin Center, Windsor, CT Office building(s) Location 16 item	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Undeveloped portion	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Industrial Building(s) Location 21	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Office building(s) Location 17	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Office building(s) Location 18	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Office building(s) Location 19	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Office building(s) Location 20	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Office building(s) Location 22 item	Nov. 30, 2013 Griffin Center South, Bloomfield, CT Office building(s) Location 23	Nov. 30, 2013 Bloomfield, CT Industrial Building(s) Location 24	Nov. 30, 2013 Breinigsville, PA Industrial Building(s) Location 25	Nov. 30, 2013 Lower Nazareth Township, PA. Industrial Building under construction	Nov. 30, 2013 Lower Nazareth Township, PA. Industrial Building(s) Location 26	Nov. 30, 2013 Hanover Township, PA. Undeveloped portion	Nov. 30, 2013 Quincy, FL Nursery Farm	Nov. 30, 2013 Simsbury, CT Residential Development	Nov. 30, 2013 Other
Real Estate and Accumulated Depreciation
Encumbrances	$ 66,708							$ 7,869				$ 5,878		$ 18,615			$ 11,150				$ 3,603			$ 6,563										$ 3,961		$ 9,069
Number of buildings								2																2							3
Initial Cost
Land	17,507				2,636		981	8	4	13	9	12	7	13	16	15	57	20	12	333	19	1	17	1,193	42	1	5	4	2	2	10	9	1,294	832	1,351	721	7,360	279	201	28
Bldg. & Improve.	24,713								1,722															7,958									1,264	4,560		9,209
Cost Capitalized Subsequent to Acquisition Improvements	150,048				638		3,415	4,582	891	7,241	3,896	8,193	3,313	5,485	7,489	9,140	15,931	8,374	6,928	889	8,202	2,161	5,828	3,616	342	765	3,938	2,771	1,980	1,534	3,954	3,757			4,437	1,974	439	9,485	6,354	2,107
Gross Amount at the end of the period
Land	17,507				2,636		981	8	4	13	9	12	7	13	16	15	57	20	12	333	19	1	17	1,193	42	1	5	4	2	2	10	9	1,294	832	1,351	721	7,360	279	201	28
Land Improvements	15,529				638		53	492	751	522	316	345	11	22	1	28	1,028	563	448		145	261	420	731		86	576	263	384	189	213	8	72	349	8	1,359		4,089		1,158
Bldg. & Bldg. Improvements	126,245							3,748	1,835	5,515	3,449	5,136	3,051	4,965	6,893	7,595	13,806	7,538	6,263		8,057	1,391	4,257	8,323		679	2,801	1,962	1,466	1,345	3,335	3,321	1,126	3,990		9,003		5,396
Tenant Improvements	16,126							342	27	1,186	131	2,712	251	498	595	1,517	1,097	273	217			509	1,151	2,469			560	546	130		406	401	66	221		821
Development Cost	16,861						3,362			18										889				51	342		1					27			4,429		439		6,354	949
Total	192,268	180,671			3,274		4,396	4,590	2,617	7,254	3,905	8,205	3,320	5,498	7,505	9,155	15,988	8,394	6,940	1,222	8,221	2,162	5,845	12,767	384	766	3,943	2,775	1,982	1,536	3,964	3,766	2,558	5,392	5,788	11,904	7,799	9,764	6,555	2,135
Accumulated Depreciation	(61,078)	(56,744)	(51,865)	(48,165)	(215)			(3,301)	(1,651)	(1,516)	(1,831)	(5,190)	(1,334)	(1,909)	(2,315)	(3,654)	(2,251)	(1,566)	(1,393)		(2,631)	(1,296)	(2,551)	(4,508)		(554)	(3,206)	(1,768)	(1,319)	(992)	(2,147)	(1,467)	(280)	(671)		(427)		(8,038)		(1,097)
Depr. Life								40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years		40 years	40 years	40 years	40 years		40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years	40 years		40 years		20 years
Maximum borrowing capacity						$ 12,500