Note 16 - Segment Information - Segment Reporting Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020	Nov. 30, 2020
Revenue from external customers		$ 6,591,829	$ 6,464,854	$ 17,702,628	$ 16,936,510
Income (loss) from operations		160,204	(513,294)	(59,537)	(1,907,607)
Total Assets		21,255,189		21,255,189		$ 18,803,013
Capital expenditures				487,515	614,443
Depreciation & Amortization				453,697	648,084
Operating Segments [Member]
Revenue from external customers	[1]	6,592,000	6,465,000	17,703,000	16,937,000
Income (loss) from operations	[1]	160,000	(513,000)	(60,000)	(1,908,000)
Income (loss) before tax	[1]	72,000	(528,000)	(247,000)	(2,069,000)
Total Assets	[1]	21,255,000	19,320,000	21,255,000	19,320,000
Capital expenditures	[1]	169,000	202,000	488,000	614,000
Depreciation & Amortization	[1]	145,000	189,000	454,000	648,000
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers		4,660,000	3,671,000	12,017,000	9,695,000
Income (loss) from operations		95,000	(210,000)	85,000	(1,367,000)
Income (loss) before tax		26,000	(249,000)	(48,000)	(1,531,000)
Total Assets		14,981,000	13,387,000	14,981,000	13,387,000
Capital expenditures		153,000	149,000	463,000	447,000
Depreciation & Amortization		85,000	123,000	271,000	377,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers		1,313,000	2,319,000	3,798,000	5,575,000
Income (loss) from operations		89,000	(188,000)	(97,000)	(306,000)
Income (loss) before tax		82,000	(152,000)	(118,000)	(272,000)
Total Assets		3,701,000	3,272,000	3,701,000	3,272,000
Capital expenditures		11,000	13,000	20,000	124,000
Depreciation & Amortization		27,000	33,000	83,000	172,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers		619,000	475,000	1,888,000	1,667,000
Income (loss) from operations		(24,000)	(115,000)	(48,000)	(235,000)
Income (loss) before tax		(36,000)	(127,000)	(81,000)	(266,000)
Total Assets		2,573,000	2,661,000	2,573,000	2,661,000
Capital expenditures		5,000	40,000	5,000	43,000
Depreciation & Amortization		$ 33,000	$ 33,000	$ 100,000	$ 99,000

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