Schedule III-Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Real Estate and Accumulated Depreciation
Encumbrances	$ 130,977
Initial Cost
Land	20,403
Bldg. & Improve.	30,666
Cost Capitalized Subsequent to Acquisition Improvements	240,783
Gross Amount at the end of the period
Land	20,403
Land improvements	30,833	$ 27,592
Bldg. & Bldg. Improvements	198,074
Tenant improvements	27,924	21,925
Construction in Progress	486
Development Costs	14,132
Total	291,852
Accumulated Depreciation	(95,112)	$ (86,801)	$ (80,784)	$ (74,762)
Industrial/Warehouse Building | Breinigsville, PA
Real Estate and Accumulated Depreciation
Encumbrances	3,478
Initial Cost
Land	832
Bldg. & Improve.	4,599
Gross Amount at the end of the period
Land	832
Land improvements	349
Bldg. & Bldg. Improvements	4,029
Tenant improvements	221
Total	5,431
Accumulated Depreciation	$ (1,356)
Depr. Life	40 years
Industrial/Warehouse Building | Concord, NH
Real Estate and Accumulated Depreciation
Encumbrances	$ 12,115
Initial Cost
Land	1,600
Bldg. & Improve.	15,189
Cost Capitalized Subsequent to Acquisition Improvements	180
Gross Amount at the end of the period
Land	1,600
Land improvements	1,573
Bldg. & Bldg. Improvements	12,910
Tenant improvements	846
Construction in Progress	40
Total	16,969
Accumulated Depreciation	$ (313)
Depr. Life	40 years
Restaurant Building | Windsor, CT
Initial Cost
Land	$ 1
Cost Capitalized Subsequent to Acquisition Improvements	2,196
Gross Amount at the end of the period
Land	1
Land improvements	266
Bldg. & Bldg. Improvements	1,414
Tenant improvements	509
Construction in Progress	7
Total	2,197
Accumulated Depreciation	$ (1,697)
Depr. Life	40 years
Nursery Farm | Granby, CT
Initial Cost
Land	$ 405
Cost Capitalized Subsequent to Acquisition Improvements	10,988
Gross Amount at the end of the period
Land	405
Land improvements	1,565
Bldg. & Bldg. Improvements	9,423
Total	11,393
Accumulated Depreciation	$ (10,475)
Depr. Life	20 years
Nursery Farm | Quincy, FL
Initial Cost
Land	$ 279
Cost Capitalized Subsequent to Acquisition Improvements	8,697
Gross Amount at the end of the period
Land	279
Land improvements	4,089
Bldg. & Bldg. Improvements	4,608
Total	8,976
Accumulated Depreciation	$ (7,971)
Depr. Life	20 years
Undeveloped Land | Lehigh Valley, PA
Initial Cost
Land	$ 2,344
Cost Capitalized Subsequent to Acquisition Improvements	313
Gross Amount at the end of the period
Land	2,344
Construction in Progress	313
Total	2,657
Residential Development | Simsbury, CT
Initial Cost
Land	201
Cost Capitalized Subsequent to Acquisition Improvements	8,337
Gross Amount at the end of the period
Land	201
Development Costs	8,337
Total	8,538
Location 1 | Industrial/Warehouse Building | Bloomfield, CT
Initial Cost
Land	1
Cost Capitalized Subsequent to Acquisition Improvements	782
Gross Amount at the end of the period
Land	1
Land improvements	92
Bldg. & Bldg. Improvements	690
Total	783
Accumulated Depreciation	$ (618)
Depr. Life	40 years
Location 2 | Industrial/Warehouse Building | Bloomfield, CT
Initial Cost
Land	$ 251
Bldg. & Improve.	1,198
Cost Capitalized Subsequent to Acquisition Improvements	1,580
Gross Amount at the end of the period
Land	251
Land improvements	321
Bldg. & Bldg. Improvements	1,740
Tenant improvements	717
Total	3,029
Accumulated Depreciation	$ (546)
Depr. Life	40 years
Location 3 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 13,844
Initial Cost
Land	4
Bldg. & Improve.	1,722
Cost Capitalized Subsequent to Acquisition Improvements	922
Gross Amount at the end of the period
Land	4
Land improvements	774
Bldg. & Bldg. Improvements	1,843
Tenant improvements	27
Total	2,648
Accumulated Depreciation	$ (1,881)
Depr. Life	40 years
Location 4 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 4
Cost Capitalized Subsequent to Acquisition Improvements	1,943
Gross Amount at the end of the period
Land	4
Land improvements	212
Bldg. & Bldg. Improvements	1,578
Tenant improvements	153
Total	1,947
Accumulated Depreciation	$ (1,425)
Depr. Life	40 years
Location 5 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 4
Cost Capitalized Subsequent to Acquisition Improvements	3,162
Gross Amount at the end of the period
Land	4
Land improvements	310
Bldg. & Bldg. Improvements	2,317
Tenant improvements	535
Total	3,166
Accumulated Depreciation	$ (2,131)
Depr. Life	40 years
Location 6 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 259
Cost Capitalized Subsequent to Acquisition Improvements	4,434
Gross Amount at the end of the period
Land	259
Land improvements	356
Bldg. & Bldg. Improvements	3,650
Tenant improvements	394
Construction in Progress	34
Total	4,693
Accumulated Depreciation	$ (2,371)
Depr. Life	40 years
Location 7 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 13
Cost Capitalized Subsequent to Acquisition Improvements	7,494
Gross Amount at the end of the period
Land	13
Land improvements	525
Bldg. & Bldg. Improvements	5,605
Tenant improvements	1,364
Total	7,507
Accumulated Depreciation	$ (2,541)
Depr. Life	40 years
Location 8 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 4,622
Initial Cost
Land	12
Cost Capitalized Subsequent to Acquisition Improvements	8,220
Gross Amount at the end of the period
Land	12
Land improvements	363
Bldg. & Bldg. Improvements	5,145
Tenant improvements	2,712
Total	8,232
Accumulated Depreciation	$ (6,022)
Depr. Life	40 years
Location 9 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 7
Cost Capitalized Subsequent to Acquisition Improvements	3,381
Gross Amount at the end of the period
Land	7
Land improvements	20
Bldg. & Bldg. Improvements	3,175
Tenant improvements	186
Total	3,388
Accumulated Depreciation	$ (1,497)
Depr. Life	40 years
Location 10 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 17,308
Initial Cost
Land	13
Cost Capitalized Subsequent to Acquisition Improvements	5,650
Gross Amount at the end of the period
Land	13
Land improvements	35
Bldg. & Bldg. Improvements	5,044
Tenant improvements	571
Total	5,663
Accumulated Depreciation	$ (2,586)
Depr. Life	40 years
Location 11 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 16
Cost Capitalized Subsequent to Acquisition Improvements	7,605
Gross Amount at the end of the period
Land	16
Land improvements	80
Bldg. & Bldg. Improvements	6,903
Tenant improvements	622
Total	7,621
Accumulated Depreciation	$ (3,236)
Depr. Life	40 years
Location 12 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 15
Cost Capitalized Subsequent to Acquisition Improvements	17,203
Gross Amount at the end of the period
Land	15
Land improvements	154
Bldg. & Bldg. Improvements	13,876
Tenant improvements	3,173
Total	17,218
Accumulated Depreciation	$ (4,604)
Depr. Life	40 years
Location 13 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 10,523
Initial Cost
Land	57
Cost Capitalized Subsequent to Acquisition Improvements	16,014
Gross Amount at the end of the period
Land	57
Land improvements	1,031
Bldg. & Bldg. Improvements	13,886
Tenant improvements	1,097
Total	16,071
Accumulated Depreciation	$ (4,304)
Depr. Life	40 years
Location 14 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 11,826
Initial Cost
Land	20
Cost Capitalized Subsequent to Acquisition Improvements	10,026
Gross Amount at the end of the period
Land	20
Land improvements	578
Bldg. & Bldg. Improvements	8,165
Tenant improvements	1,283
Total	10,046
Accumulated Depreciation	$ (2,682)
Depr. Life	40 years
Location 15 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 12
Cost Capitalized Subsequent to Acquisition Improvements	6,962
Gross Amount at the end of the period
Land	12
Land improvements	448
Bldg. & Bldg. Improvements	6,297
Tenant improvements	217
Total	6,974
Accumulated Depreciation	$ (2,344)
Depr. Life	40 years
Location 16 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 6,597
Initial Cost
Land	19
Cost Capitalized Subsequent to Acquisition Improvements	8,229
Gross Amount at the end of the period
Land	19
Land improvements	164
Bldg. & Bldg. Improvements	8,065
Total	8,248
Accumulated Depreciation	$ (3,478)
Depr. Life	40 years
Location 17 | Industrial/Warehouse Building | Lower Nazareth Township, PA.
Real Estate and Accumulated Depreciation
Encumbrances	$ 20,221
Initial Cost
Land	1,351
Cost Capitalized Subsequent to Acquisition Improvements	15,490
Gross Amount at the end of the period
Land	1,351
Land improvements	1,366
Bldg. & Bldg. Improvements	12,874
Tenant improvements	1,250
Total	16,841
Accumulated Depreciation	$ (2,078)
Depr. Life	40 years
Location 18 | Industrial/Warehouse Building | Lower Nazareth Township, PA.
Initial Cost
Land	$ 721
Cost Capitalized Subsequent to Acquisition Improvements	11,148
Gross Amount at the end of the period
Land	721
Land improvements	1,359
Bldg. & Bldg. Improvements	8,968
Tenant improvements	821
Total	11,869
Accumulated Depreciation	$ (2,447)
Depr. Life	40 years
Location 19 | Industrial/Warehouse Building | Hanover Township, PA.
Real Estate and Accumulated Depreciation
Encumbrances	$ 26,076
Initial Cost
Land	4,022
Cost Capitalized Subsequent to Acquisition Improvements	16,279
Gross Amount at the end of the period
Land	4,022
Land improvements	3,989
Bldg. & Bldg. Improvements	11,076
Tenant improvements	1,214
Total	20,301
Accumulated Depreciation	$ (1,669)
Depr. Life	40 years
Location 20 | Industrial/Warehouse Building | Hanover Township, PA.
Initial Cost
Land	$ 3,620
Cost Capitalized Subsequent to Acquisition Improvements	15,542
Gross Amount at the end of the period
Land	3,620
Land improvements	4,468
Bldg. & Bldg. Improvements	9,134
Tenant improvements	1,940
Total	19,162
Accumulated Depreciation	$ (873)
Depr. Life	40 years
Location 21 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 5
Cost Capitalized Subsequent to Acquisition Improvements	4,307
Gross Amount at the end of the period
Land	5
Land improvements	594
Bldg. & Bldg. Improvements	2,961
Tenant improvements	752
Total	4,312
Accumulated Depreciation	$ (3,681)
Depr. Life	40 years
Location 22 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 4
Cost Capitalized Subsequent to Acquisition Improvements	2,777
Gross Amount at the end of the period
Land	4
Land improvements	269
Bldg. & Bldg. Improvements	1,962
Tenant improvements	546
Total	2,781
Accumulated Depreciation	$ (2,321)
Depr. Life	40 years
Location 23 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 2
Cost Capitalized Subsequent to Acquisition Improvements	2,332
Gross Amount at the end of the period
Land	2
Land improvements	384
Bldg. & Bldg. Improvements	1,723
Tenant improvements	225
Total	2,334
Accumulated Depreciation	$ (1,599)
Depr. Life	40 years
Location 24 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 2
Cost Capitalized Subsequent to Acquisition Improvements	3,126
Gross Amount at the end of the period
Land	2
Land improvements	195
Bldg. & Bldg. Improvements	2,248
Tenant improvements	683
Total	3,128
Accumulated Depreciation	$ (1,128)
Depr. Life	40 years
Location 25 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 3
Cost Capitalized Subsequent to Acquisition Improvements	1,743
Gross Amount at the end of the period
Land	3
Land improvements	140
Bldg. & Bldg. Improvements	1,354
Tenant improvements	249
Total	1,746
Accumulated Depreciation	$ (1,094)
Depr. Life	40 years
Location 26 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 3
Cost Capitalized Subsequent to Acquisition Improvements	1,540
Gross Amount at the end of the period
Land	3
Land improvements	62
Bldg. & Bldg. Improvements	1,347
Tenant improvements	131
Total	1,543
Accumulated Depreciation	$ (1,047)
Depr. Life	40 years
Location 27 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 3
Cost Capitalized Subsequent to Acquisition Improvements	847
Gross Amount at the end of the period
Land	3
Land improvements	65
Bldg. & Bldg. Improvements	667
Tenant improvements	115
Total	850
Accumulated Depreciation	$ (611)
Depr. Life	40 years
Location 28 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 9
Cost Capitalized Subsequent to Acquisition Improvements	4,564
Gross Amount at the end of the period
Land	9
Land improvements	28
Bldg. & Bldg. Improvements	3,690
Tenant improvements	846
Total	4,573
Accumulated Depreciation	$ (1,822)
Depr. Life	40 years
Location 29 | Office Flex Building | Windsor, CT
Initial Cost
Land	$ 17
Cost Capitalized Subsequent to Acquisition Improvements	6,052
Gross Amount at the end of the period
Land	17
Land improvements	434
Bldg. & Bldg. Improvements	4,470
Tenant improvements	1,148
Total	6,069
Accumulated Depreciation	$ (3,134)
Depr. Life	40 years
Location 30 | Office Flex Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 4,367
Initial Cost
Land	616
Bldg. & Improve.	3,954
Cost Capitalized Subsequent to Acquisition Improvements	2,762
Gross Amount at the end of the period
Land	616
Land improvements	375
Bldg. & Bldg. Improvements	4,841
Tenant improvements	1,500
Total	7,332
Accumulated Depreciation	$ (3,057)
Depr. Life	40 years
Location 31 | Office Flex Building | Windsor, CT
Initial Cost
Land	$ 577
Bldg. & Improve.	4,004
Cost Capitalized Subsequent to Acquisition Improvements	1,758
Gross Amount at the end of the period
Land	577
Land improvements	381
Bldg. & Bldg. Improvements	4,147
Tenant improvements	1,226
Construction in Progress	8
Total	6,339
Accumulated Depreciation	$ (3,299)
Depr. Life	40 years
Location 32 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 16
Cost Capitalized Subsequent to Acquisition Improvements	9,149
Gross Amount at the end of the period
Land	16
Land improvements	2,249
Bldg. & Bldg. Improvements	6,249
Tenant improvements	651
Total	9,165
Accumulated Depreciation	$ (41)
Depr. Life	40 years
New England Tradeport [Member] | Undeveloped Land
Initial Cost
Land	$ 738
Cost Capitalized Subsequent to Acquisition Improvements	2,977
Gross Amount at the end of the period
Land	738
Land improvements	90
Construction in Progress	84
Development Costs	2,803
Total	3,715
Accumulated Depreciation	(62)
Griffin Center/Griffin Center South | Undeveloped Land
Initial Cost
Land	435
Cost Capitalized Subsequent to Acquisition Improvements	1,572
Gross Amount at the end of the period
Land	435
Land improvements	451
Development Costs	1,121
Total	2,007
Accumulated Depreciation	(442)
Phoenix Crossing [Member] | Undeveloped Land
Initial Cost
Land	60
Cost Capitalized Subsequent to Acquisition Improvements	1,464
Gross Amount at the end of the period
Land	60
Development Costs	1,464
Total	1,524
Other | Undeveloped Land
Initial Cost
Land	1,830
Cost Capitalized Subsequent to Acquisition Improvements	1,036
Gross Amount at the end of the period
Land	1,830
Land improvements	629
Development Costs	407
Total	2,866
Accumulated Depreciation	$ (629)