Note 17 - Segment Information - Segment Reporting Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018	Nov. 30, 2018
Revenue from external customers	$ 5,503,622	$ 5,280,269	$ 15,375,104	$ 15,940,268
Income (loss) from operations	(304,844)	(559,107)	(1,396,980)	(1,325,943)
Total Assets	20,867,996		20,867,996		$ 21,325,474
Capital expenditures			367,450	265,418
Depreciation & Amortization			774,068	681,939
Operating Segments [Member]
Revenue from external customers	5,504,000	5,280,000	15,375,000	15,940,000
Income (loss) from operations	(305,000)	(559,000)	(1,397,000)	(1,326,000)
Income (loss) before tax	(370,000)	(949,000)	(1,610,000)	(2,034,000)
Total Assets	20,868,000	22,175,000	20,868,000	22,175,000
Capital expenditures	182,000	105,000	367,000	266,000
Depreciation & Amortization	224,000	273,000	774,000	682,000
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers	3,194,000	3,913,000	9,441,000	11,778,000
Income (loss) from operations	(435,000)	(450,000)	(1,334,000)	(988,000)
Income (loss) before tax	(496,000)	(835,000)	(1,527,000)	(1,680,000)
Total Assets	14,383,000	15,999,000	14,383,000	15,999,000
Capital expenditures	92,000	92,000	201,000	163,000
Depreciation & Amortization	126,000	126,000	375,000	391,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers	1,802,000	773,000	4,382,000	2,346,000
Income (loss) from operations	146,000	(141,000)	(14,000)	(347,000)
Income (loss) before tax	151,000	(136,000)	(4,000)	(330,000)
Total Assets	3,917,000	3,692,000	3,917,000	3,692,000
Capital expenditures	75,000	13,000	123,000	99,000
Depreciation & Amortization	66,000	116,000	303,000	196,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers	508,000	594,000	1,552,000	1,816,000
Income (loss) from operations	(16,000)	32,000	(49,000)	9,000
Income (loss) before tax	(25,000)	22,000	(79,000)	(24,000)
Total Assets	2,568,000	2,484,000	2,568,000	2,484,000
Capital expenditures	15,000		43,000	4,000
Depreciation & Amortization	$ 32,000	$ 31,000	$ 96,000	$ 95,000