Schedule III-Real Estate and Accumulated Depreciation (Details) (USD $)							12 Months Ended													12 Months Ended					12 Months Ended				12 Months Ended							12 Months Ended
	Dec. 01, 2012	Dec. 03, 2011	Apr. 28, 2011 Revolving line of credit	Dec. 01, 2012 Undeveloped Land	Dec. 01, 2012 Buildings included as collateral Buildings - Locations 13-21 Revolving line of credit	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Undeveloped portion	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 1 item	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 2	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 3	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 4	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 5	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 6	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 7	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 8	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 9	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 10	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 11	Dec. 01, 2012 New England Tradeport, Windsor/E. Granby, CT Industrial Building(s) Location 12	Dec. 01, 2012 Griffin Center, Windsor, CT Undeveloped portion	Dec. 01, 2012 Griffin Center, Windsor, CT Flex Building, 1985 BHA Location 13	Dec. 01, 2012 Griffin Center, Windsor, CT Restaurant Building, 1936 BHA Location 14	Dec. 01, 2012 Griffin Center, Windsor, CT Office building(s) Location 15	Dec. 01, 2012 Griffin Center, Windsor, CT Office building(s) Location 16 item	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Undeveloped portion	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Industrial Building(s) Location 21	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Office building(s) Location 16	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Office building(s) Location 17	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Office building(s) Location 18	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Office building(s) Location 19	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Office building(s) Location 20	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Office building(s) Location 22 item	Dec. 01, 2012 Griffin Center South, Bloomfield, CT Office building(s) Location 23	Dec. 01, 2012 Bloomfield, CT Industrial Building(s) Location 24	Dec. 01, 2012 Breinigsville, PA Industrial Building(s) Location 25	Dec. 01, 2012 Lehigh Valley of Tradepost, Lower Nazaceth Undeveloped portion	Dec. 01, 2012 Lehigh Valley of Tradepost, Lower Nazaceth Industrial Building(s) Location 26	Dec. 01, 2012 Quincy, FL Nursery Farm	Dec. 01, 2012 Simsbury, CT Residential Development	Dec. 01, 2012 Other
Real Estate and Accumulated Depreciation
Encumbrances	$ 59,489,000						$ 8,034,000				$ 6,306,000		$ 19,018,000			$ 11,396,000				$ 3,943,000			$ 6,726,000											$ 4,066,000
Number of buildings							2																2								3
Initial Cost
Land	10,267,000			2,728,000		926,000	8,000	4,000	13,000	9,000	12,000	7,000	13,000	16,000	15,000	57,000	20,000	12,000	403,000	19,000	1,000	17,000	1,193,000	42,000	1,000		5,000	4,000	2,000	2,000	10,000	9,000	1,294,000	832,000	1,351,000	721,000	279,000	201,000	41,000
Bldg. & Improve.	24,713,000							1,722,000															7,958,000										1,264,000	4,560,000		9,209,000
Cost Capitalized Subsequent to Acquisition Improvements	145,691,000			638,000		3,022,000	4,426,000	891,000	7,241,000	3,896,000	8,167,000	3,313,000	5,500,000	7,489,000	9,137,000	15,931,000	8,345,000	6,902,000	889,000	8,202,000	2,161,000	5,828,000	2,711,000	342,000	765,000		3,935,000	2,771,000	1,948,000	1,528,000	3,898,000	3,757,000			3,018,000		10,588,000	6,161,000	2,291,000
Gross Amount at the end of the period
Land	10,267,000			2,728,000		926,000	8,000	4,000	13,000	9,000	12,000	7,000	13,000	16,000	15,000	57,000	20,000	12,000	403,000	19,000	1,000	17,000	1,193,000	42,000	1,000		5,000	4,000	2,000	2,000	10,000	9,000	1,294,000	832,000	1,351,000	721,000	279,000	201,000	41,000
Land Improvements	15,138,000			638,000		53,000	487,000	751,000	522,000	316,000	342,000	11,000	22,000	1,000	25,000	1,028,000	563,000	448,000		145,000	261,000	420,000	731,000		86,000		576,000	263,000	376,000	189,000	155,000	8,000	72,000	349,000		1,053,000	4,089,000		1,158,000
Bldg. & Bldg. Improvements	125,971,000						3,682,000	1,835,000	5,515,000	3,449,000	5,113,000	3,051,000	4,962,000	6,893,000	7,595,000	13,806,000	7,509,000	6,240,000		8,057,000	1,391,000	4,257,000	7,966,000		679,000		2,799,000	1,962,000	1,442,000	1,339,000	3,337,000	3,321,000	1,126,000	3,990,000		8,156,000	6,499,000
Tenant Improvements	14,738,000						257,000	27,000	1,186,000	131,000	2,712,000	251,000	516,000	595,000	1,517,000	1,097,000	273,000	214,000			509,000	1,151,000	1,972,000				560,000	546,000	130,000		406,000	401,000	66,000	221,000
Development Cost	14,557,000					2,969,000			18,000										889,000					342,000								27,000			3,018,000			6,161,000	1,133,000
Total	180,671,000	168,160,000		3,366,000		3,948,000	4,434,000	2,617,000	7,254,000	3,905,000	8,179,000	3,320,000	5,513,000	7,505,000	9,152,000	15,988,000	8,365,000	6,914,000	1,292,000	8,221,000	2,162,000	5,845,000	11,862,000	384,000	766,000		3,940,000	2,775,000	1,950,000	1,530,000	3,908,000	3,766,000	2,558,000	5,392,000	4,369,000	9,930,000	10,867,000	6,362,000	2,332,000
Accumulated Depreciation	(56,744,000)			(180,000)			(3,163,000)	(1,595,000)	(1,227,000)	(1,720,000)	(4,803,000)	(1,239,000)	(1,785,000)	(2,061,000)	(3,385,000)	(1,731,000)	(1,309,000)	(1,118,000)		(2,421,000)	(1,196,000)	(2,321,000)	(3,965,000)		(531,000)		(3,086,000)	(1,650,000)	(1,224,000)	(954,000)	(1,992,000)	(1,247,000)	(234,000)	(499,000)		(71,000)	(8,946,000)		(1,091,000)
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			$ 12,500,000		$ 12,500,000