Note 16 - Segment Information - Segment Reporting Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Nov. 30, 2018
Revenue from external customers		$ 5,280,269	$ 6,549,772	$ 15,940,268	$ 15,660,294
Income (loss) from operations		(559,107)	109,240	(1,325,943)	(964,576)
Total Assets		22,175,249		22,175,249		$ 24,379,833
Capital expenditures				265,418	472,031
Depreciation & Amortization				681,939	516,642
Operating Segments [Member]
Revenue from external customers	[1]	5,280,000	6,550,000	15,940,000	15,660,000
Income (loss) from operations	[1]	(559,000)	109,000	(1,326,000)	(964,000)
Income (loss) before tax	[1]	(949,000)	93,000	(2,034,000)	(1,010,000)
Total Assets	[1]	22,175,000	24,756,000	22,175,000	24,756,000
Capital expenditures	[1]	105,000	178,000	266,000	472,000
Depreciation & Amortization	[1]	73,000	174,000	682,000	517,000
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers		3,913,000	5,065,000	11,778,000	11,595,000
Income (loss) from operations		(450,000)	118,000	(988,000)	(758,000)
Income (loss) before tax		(835,000)	123,000	(1,681,000)	(743,000)
Total Assets		15,999,000	18,941,000	15,999,000	18,941,000
Capital expenditures		92,000	61,000	163,000	265,000
Depreciation & Amortization		126,000	125,000	391,000	376,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers		773,000	767,000	2,346,000	2,043,000
Income (loss) from operations		(141,000)	(37,000)	(347,000)	(209,000)
Income (loss) before tax		(136,000)	(45,000)	(329,000)	(237,000)
Total Assets		3,692,000	3,094,000	3,692,000	3,094,000
Capital expenditures		13,000	117,000	99,000	117,000
Depreciation & Amortization		116,000	17,000	196,000	46,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers		594,000	718,000	1,816,000	2,022,000
Income (loss) from operations		32,000	28,000	9,000	3,000
Income (loss) before tax		22,000	15,000	(24,000)	(30,000)
Total Assets		2,484,000	2,721,000	2,484,000	2,721,000
Capital expenditures				4,000	90,000
Depreciation & Amortization		$ 31,000	$ 32,000	$ 95,000	$ 95,000

[1] The consolidated total in the table is a sum of segment figures and may not tie to actual figures in the condensed consolidated financial statements due to rounding.