Schedule III-Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Real Estate and Accumulated Depreciation
Encumbrances	$ 144,473
Initial Cost
Land	30,750
Bldg. & Improve.	38,869
Cost Capitalized Subsequent to Acquisition Improvements	274,030
Gross Amount at the end of the period
Encumbrances	144,473
Land	30,750
Land improvements	40,992	$ 38,280
Bldg. & Bldg. Improvements	227,643
Tenant improvements	30,318	29,163
Construction in Progress	3,542
Development Costs	10,404
Real estate assets held for sale, gross	343,649
Accumulated Depreciation	(105,035)	$ (105,004)	$ (95,112)	$ (86,801)
Industrial/Warehouse Building | Breinigsville, PA
Real Estate and Accumulated Depreciation
Encumbrances	3,206
Initial Cost
Land	832
Bldg. & Improve.	4,599
Gross Amount at the end of the period
Encumbrances	3,206
Land	832
Land improvements	349
Bldg. & Bldg. Improvements	4,029
Tenant improvements	221
Real estate assets held for sale, gross	5,431
Accumulated Depreciation	$ (1,715)
Depr. Life	40 years
Industrial/Warehouse Building | Concord, NH
Initial Cost
Land	$ 1,150
Bldg. & Improve.	8,203
Gross Amount at the end of the period
Land	1,150
Land improvements	832
Bldg. & Bldg. Improvements	6,517
Tenant improvements	854
Real estate assets held for sale, gross	9,353
Accumulated Depreciation	$ (32)
Depr. Life	40 years
Nursery Farm | Granby, CT
Initial Cost
Land	$ 376
Cost Capitalized Subsequent to Acquisition Improvements	10,989
Gross Amount at the end of the period
Land	376
Land improvements	1,565
Bldg. & Bldg. Improvements	9,424
Real estate assets held for sale, gross	11,365
Accumulated Depreciation	$ (10,688)
Depr. Life	20 years
Undeveloped Land | Lehigh Valley, PA
Initial Cost
Land	$ 2,226
Cost Capitalized Subsequent to Acquisition Improvements	485
Gross Amount at the end of the period
Land	2,226
Construction in Progress	485
Real estate assets held for sale, gross	2,711
Undeveloped Land | Meckleburg, NC
Initial Cost
Land	5,714
Cost Capitalized Subsequent to Acquisition Improvements	393
Gross Amount at the end of the period
Land	5,714
Construction in Progress	393
Real estate assets held for sale, gross	6,107
Residential Development | Simsbury, CT
Initial Cost
Land	201
Cost Capitalized Subsequent to Acquisition Improvements	5,237
Gross Amount at the end of the period
Land	201
Development Costs	5,237
Real estate assets held for sale, gross	5,438
Location 1 | Industrial/Warehouse Building | Bloomfield, CT
Initial Cost
Land	1
Cost Capitalized Subsequent to Acquisition Improvements	866
Gross Amount at the end of the period
Land	1
Land improvements	92
Bldg. & Bldg. Improvements	774
Real estate assets held for sale, gross	867
Accumulated Depreciation	$ (651)
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	1,599
Gross Amount at the end of the period
Land	251
Land improvements	327
Bldg. & Bldg. Improvements	1,752
Tenant improvements	718
Real estate assets held for sale, gross	3,048
Accumulated Depreciation	$ (867)
Depr. Life	40 years
Location 3 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 13,115
Initial Cost
Land	4
Bldg. & Improve.	1,722
Cost Capitalized Subsequent to Acquisition Improvements	922
Gross Amount at the end of the period
Encumbrances	13,115
Land	4
Land improvements	774
Bldg. & Bldg. Improvements	1,843
Tenant improvements	27
Real estate assets held for sale, gross	2,648
Accumulated Depreciation	$ (1,992)
Depr. Life	40 years
Location 4 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 4
Cost Capitalized Subsequent to Acquisition Improvements	2,161
Gross Amount at the end of the period
Land	4
Land improvements	225
Bldg. & Bldg. Improvements	1,654
Tenant improvements	282
Real estate assets held for sale, gross	2,165
Accumulated Depreciation	$ (1,518)
Depr. Life	40 years
Location 5 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 4
Cost Capitalized Subsequent to Acquisition Improvements	3,215
Gross Amount at the end of the period
Land	4
Land improvements	313
Bldg. & Bldg. Improvements	2,354
Tenant improvements	548
Real estate assets held for sale, gross	3,219
Accumulated Depreciation	$ (2,413)
Depr. Life	40 years
Location 6 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 259
Cost Capitalized Subsequent to Acquisition Improvements	5,352
Gross Amount at the end of the period
Land	259
Land improvements	1,281
Bldg. & Bldg. Improvements	3,677
Tenant improvements	394
Real estate assets held for sale, gross	5,611
Accumulated Depreciation	$ (2,646)
Depr. Life	40 years
Location 7 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 13
Cost Capitalized Subsequent to Acquisition Improvements	7,536
Gross Amount at the end of the period
Land	13
Land improvements	530
Bldg. & Bldg. Improvements	5,642
Tenant improvements	1,364
Real estate assets held for sale, gross	7,549
Accumulated Depreciation	$ (3,015)
Depr. Life	40 years
Location 8 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 4,011
Initial Cost
Land	12
Cost Capitalized Subsequent to Acquisition Improvements	8,329
Gross Amount at the end of the period
Encumbrances	4,011
Land	12
Land improvements	363
Bldg. & Bldg. Improvements	5,254
Tenant improvements	2,712
Real estate assets held for sale, gross	8,341
Accumulated Depreciation	$ (6,384)
Depr. Life	40 years
Location 9 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 7
Cost Capitalized Subsequent to Acquisition Improvements	3,386
Gross Amount at the end of the period
Land	7
Land improvements	20
Bldg. & Bldg. Improvements	3,180
Tenant improvements	186
Real estate assets held for sale, gross	3,393
Accumulated Depreciation	$ (1,756)
Depr. Life	40 years
Location 10 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 16,634
Initial Cost
Land	13
Cost Capitalized Subsequent to Acquisition Improvements	6,098
Gross Amount at the end of the period
Encumbrances	16,634
Land	13
Land improvements	62
Bldg. & Bldg. Improvements	5,250
Tenant improvements	786
Real estate assets held for sale, gross	6,111
Accumulated Depreciation	$ (2,937)
Depr. Life	40 years
Location 11 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 16
Cost Capitalized Subsequent to Acquisition Improvements	7,835
Gross Amount at the end of the period
Land	16
Land improvements	91
Bldg. & Bldg. Improvements	6,941
Tenant improvements	622
Construction in Progress	181
Real estate assets held for sale, gross	7,851
Accumulated Depreciation	$ (3,666)
Depr. Life	40 years
Location 12 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 15
Cost Capitalized Subsequent to Acquisition Improvements	17,244
Gross Amount at the end of the period
Land	15
Land improvements	159
Bldg. & Bldg. Improvements	13,912
Tenant improvements	3,173
Real estate assets held for sale, gross	17,259
Accumulated Depreciation	$ (6,350)
Depr. Life	40 years
Location 13 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 10,034
Initial Cost
Land	57
Cost Capitalized Subsequent to Acquisition Improvements	16,071
Gross Amount at the end of the period
Encumbrances	10,034
Land	57
Land improvements	1,042
Bldg. & Bldg. Improvements	13,932
Tenant improvements	1,097
Real estate assets held for sale, gross	16,128
Accumulated Depreciation	$ (5,183)
Depr. Life	40 years
Location 14 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 18,069
Initial Cost
Land	20
Cost Capitalized Subsequent to Acquisition Improvements	10,274
Gross Amount at the end of the period
Encumbrances	18,069
Land	20
Land improvements	804
Bldg. & Bldg. Improvements	8,187
Tenant improvements	1,283
Real estate assets held for sale, gross	10,294
Accumulated Depreciation	$ (3,471)
Depr. Life	40 years
Location 15 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 12
Cost Capitalized Subsequent to Acquisition Improvements	6,975
Gross Amount at the end of the period
Land	12
Land improvements	470
Bldg. & Bldg. Improvements	6,288
Tenant improvements	217
Real estate assets held for sale, gross	6,987
Accumulated Depreciation	$ (2,720)
Depr. Life	40 years
Location 16 | Industrial/Warehouse Building | Windsor, CT
Initial Cost
Land	$ 16
Cost Capitalized Subsequent to Acquisition Improvements	10,017
Gross Amount at the end of the period
Land	16
Land improvements	2,364
Bldg. & Bldg. Improvements	6,917
Tenant improvements	736
Real estate assets held for sale, gross	10,033
Accumulated Depreciation	$ (894)
Depr. Life	40 years
Location 17 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 14,030
Initial Cost
Land	26
Cost Capitalized Subsequent to Acquisition Improvements	15,547
Gross Amount at the end of the period
Encumbrances	14,030
Land	26
Land improvements	3,357
Bldg. & Bldg. Improvements	11,078
Tenant improvements	1,112
Real estate assets held for sale, gross	15,573
Accumulated Depreciation	$ (739)
Depr. Life	40 years
Location 18 | Industrial/Warehouse Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 5,725
Initial Cost
Land	19
Cost Capitalized Subsequent to Acquisition Improvements	8,236
Gross Amount at the end of the period
Encumbrances	5,725
Land	19
Land improvements	171
Bldg. & Bldg. Improvements	8,065
Real estate assets held for sale, gross	8,255
Accumulated Depreciation	$ (3,902)
Depr. Life	40 years
Location 19 | Industrial/Warehouse Building | Lower Nazareth Township, PA.
Real Estate and Accumulated Depreciation
Encumbrances	$ 19,101
Initial Cost
Land	1,351
Cost Capitalized Subsequent to Acquisition Improvements	15,496
Gross Amount at the end of the period
Encumbrances	19,101
Land	1,351
Land improvements	1,372
Bldg. & Bldg. Improvements	12,874
Tenant improvements	1,250
Real estate assets held for sale, gross	16,847
Accumulated Depreciation	$ (3,483)
Depr. Life	40 years
Location 20 | Industrial/Warehouse Building | Lower Nazareth Township, PA.
Initial Cost
Land	$ 721
Cost Capitalized Subsequent to Acquisition Improvements	11,276
Gross Amount at the end of the period
Land	721
Land improvements	1,374
Bldg. & Bldg. Improvements	9,057
Tenant improvements	845
Real estate assets held for sale, gross	11,997
Accumulated Depreciation	$ (3,260)
Depr. Life	40 years
Location 21 | Industrial/Warehouse Building | Hanover Township, PA.
Real Estate and Accumulated Depreciation
Encumbrances	$ 24,701
Initial Cost
Land	3,620
Cost Capitalized Subsequent to Acquisition Improvements	16,922
Gross Amount at the end of the period
Encumbrances	24,701
Land	3,620
Land improvements	4,502
Bldg. & Bldg. Improvements	9,139
Tenant improvements	1,940
Construction in Progress	1,341
Real estate assets held for sale, gross	20,542
Accumulated Depreciation	$ (2,414)
Depr. Life	40 years
Location 22 | Industrial/Warehouse Building | Hanover Township, PA.
Initial Cost
Land	$ 4,022
Cost Capitalized Subsequent to Acquisition Improvements	16,301
Gross Amount at the end of the period
Land	4,022
Land improvements	4,011
Bldg. & Bldg. Improvements	11,076
Tenant improvements	1,214
Real estate assets held for sale, gross	20,323
Accumulated Depreciation	$ (3,197)
Depr. Life	40 years
Location 23 | Industrial/Warehouse Building | Allentown, PA
Initial Cost
Land	$ 2,344
Cost Capitalized Subsequent to Acquisition Improvements	8,150
Gross Amount at the end of the period
Land	2,344
Land improvements	2,996
Bldg. & Bldg. Improvements	5,073
Construction in Progress	81
Real estate assets held for sale, gross	10,494
Accumulated Depreciation	$ (340)
Depr. Life	40 years
Location 24 | Industrial/Warehouse Building | Concord, NH
Real Estate and Accumulated Depreciation
Encumbrances	$ 11,673
Initial Cost
Land	1,600
Bldg. & Improve.	15,189
Cost Capitalized Subsequent to Acquisition Improvements	322
Gross Amount at the end of the period
Encumbrances	11,673
Land	1,600
Land improvements	1,595
Bldg. & Bldg. Improvements	13,042
Tenant improvements	874
Real estate assets held for sale, gross	17,111
Accumulated Depreciation	$ (1,580)
Depr. Life	40 years
Location 25 | Industrial/Warehouse Building | Concord, NH
Initial Cost
Land	$ 1,412
Cost Capitalized Subsequent to Acquisition Improvements	8,578
Gross Amount at the end of the period
Land	1,412
Land improvements	2,636
Bldg. & Bldg. Improvements	5,263
Construction in Progress	679
Real estate assets held for sale, gross	9,990
Accumulated Depreciation	$ (45)
Depr. Life	40 years
Location 26 | Industrial/Warehouse Building | Concord, NH
Initial Cost
Land	$ 1,304
Cost Capitalized Subsequent to Acquisition Improvements	7,746
Gross Amount at the end of the period
Land	1,304
Land improvements	2,451
Bldg. & Bldg. Improvements	5,295
Real estate assets held for sale, gross	9,050
Accumulated Depreciation	$ (44)
Depr. Life	40 years
Location 27 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 5
Cost Capitalized Subsequent to Acquisition Improvements	4,425
Gross Amount at the end of the period
Land	5
Land improvements	594
Bldg. & Bldg. Improvements	3,081
Tenant improvements	750
Real estate assets held for sale, gross	4,430
Accumulated Depreciation	$ (3,772)
Depr. Life	40 years
Location 28 | 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
Real estate assets held for sale, gross	2,781
Accumulated Depreciation	$ (2,435)
Depr. Life	40 years
Location 29 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 2
Cost Capitalized Subsequent to Acquisition Improvements	2,335
Gross Amount at the end of the period
Land	2
Land improvements	384
Bldg. & Bldg. Improvements	1,726
Tenant improvements	225
Real estate assets held for sale, gross	2,337
Accumulated Depreciation	$ (1,782)
Depr. Life	40 years
Location 30 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 2
Cost Capitalized Subsequent to Acquisition Improvements	3,212
Gross Amount at the end of the period
Land	2
Land improvements	214
Bldg. & Bldg. Improvements	2,301
Tenant improvements	697
Real estate assets held for sale, gross	3,214
Accumulated Depreciation	$ (1,446)
Depr. Life	40 years
Location 31 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 3
Cost Capitalized Subsequent to Acquisition Improvements	1,810
Gross Amount at the end of the period
Land	3
Land improvements	140
Bldg. & Bldg. Improvements	1,357
Tenant improvements	249
Construction in Progress	64
Real estate assets held for sale, gross	1,813
Accumulated Depreciation	$ (1,239)
Depr. Life	40 years
Location 32 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 3
Cost Capitalized Subsequent to Acquisition Improvements	1,825
Gross Amount at the end of the period
Land	3
Land improvements	85
Bldg. & Bldg. Improvements	1,525
Tenant improvements	215
Real estate assets held for sale, gross	1,828
Accumulated Depreciation	$ (1,074)
Depr. Life	40 years
Location 33 | Office Flex Building | Bloomfield, CT
Initial Cost
Land	$ 3
Cost Capitalized Subsequent to Acquisition Improvements	871
Gross Amount at the end of the period
Land	3
Land improvements	89
Bldg. & Bldg. Improvements	667
Tenant improvements	115
Real estate assets held for sale, gross	874
Accumulated Depreciation	$ (674)
Depr. Life	40 years
Location 34 | 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
Real estate assets held for sale, gross	4,573
Accumulated Depreciation	$ (2,266)
Depr. Life	40 years
Location 35 | Office Flex Building | Windsor, CT
Initial Cost
Land	$ 17
Cost Capitalized Subsequent to Acquisition Improvements	6,117
Gross Amount at the end of the period
Land	17
Land improvements	434
Bldg. & Bldg. Improvements	4,535
Tenant improvements	1,148
Real estate assets held for sale, gross	6,134
Accumulated Depreciation	$ (3,617)
Depr. Life	40 years
Location 36 | Office Flex Building | Windsor, CT
Real Estate and Accumulated Depreciation
Encumbrances	$ 4,174
Initial Cost
Land	616
Bldg. & Improve.	3,954
Cost Capitalized Subsequent to Acquisition Improvements	2,853
Gross Amount at the end of the period
Encumbrances	4,174
Land	616
Land improvements	384
Bldg. & Bldg. Improvements	4,863
Tenant improvements	1,538
Construction in Progress	22
Real estate assets held for sale, gross	7,423
Accumulated Depreciation	$ (3,865)
Depr. Life	40 years
Location 37 | Office Flex Building | Windsor, CT
Initial Cost
Land	$ 577
Bldg. & Improve.	4,004
Cost Capitalized Subsequent to Acquisition Improvements	2,670
Gross Amount at the end of the period
Land	577
Land improvements	397
Bldg. & Bldg. Improvements	4,447
Tenant improvements	1,534
Construction in Progress	296
Real estate assets held for sale, gross	7,251
Accumulated Depreciation	$ (3,409)
Depr. Life	40 years
NE Tradeport | Undeveloped Land
Initial Cost
Land	$ 712
Cost Capitalized Subsequent to Acquisition Improvements	2,230
Gross Amount at the end of the period
Land	712
Land improvements	90
Development Costs	2,140
Real estate assets held for sale, gross	2,942
Accumulated Depreciation	(69)
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
Real estate assets held for sale, gross	2,007
Accumulated Depreciation	(446)
Phoenix Crossing [Member] | Undeveloped Land
Initial Cost
Land	60
Cost Capitalized Subsequent to Acquisition Improvements	1,451
Gross Amount at the end of the period
Land	60
Development Costs	1,451
Real estate assets held for sale, gross	1,511
Other | Undeveloped Land
Initial Cost
Land	680
Cost Capitalized Subsequent to Acquisition Improvements	1,760
Gross Amount at the end of the period
Land	680
Land improvements	1,305
Development Costs	455
Real estate assets held for sale, gross	2,440
Accumulated Depreciation	$ (1,039)