Note 17 - Segment Information - Segment Reporting Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	Nov. 30, 2019
Revenue from external customers	$ 6,464,854	$ 5,503,622	$ 16,936,510	$ 15,375,104
Income (loss) from operations	(513,294)	(304,844)	(1,907,607)	(1,396,980)
Total Assets	19,319,678		19,319,678		$ 19,346,938
Capital expenditures			614,443	367,450
Depreciation & Amortization			648,084	774,068
Operating Segments [Member]
Revenue from external customers	6,465,000	5,504,000	16,937,000	15,375,000
Income (loss) from operations	(513,000)	(305,000)	(1,908,000)	(1,397,000)
Income (loss) before tax	(528,000)	(370,000)	(2,069,000)	(1,610,000)
Total Assets	19,320,000	20,868,000	19,320,000	20,868,000
Capital expenditures	202,000	182,000	614,000	367,000
Depreciation & Amortization	189,000	224,000	648,000	774,000
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers	3,671,000	3,194,000	9,695,000	9,441,000
Income (loss) from operations	(210,000)	(435,000)	(1,367,000)	(1,334,000)
Income (loss) before tax	(249,000)	(496,000)	(1,531,000)	(1,527,000)
Total Assets	13,387,000	14,383,000	13,387,000	14,383,000
Capital expenditures	149,000	92,000	447,000	201,000
Depreciation & Amortization	123,000	126,000	377,000	375,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers	2,319,000	1,802,000	5,575,000	4,382,000
Income (loss) from operations	(188,000)	146,000	(306,000)	(14,000)
Income (loss) before tax	(152,000)	151,000	(272,000)	(4,000)
Total Assets	3,272,000	3,917,000	3,272,000	3,917,000
Capital expenditures	13,000	75,000	124,000	123,000
Depreciation & Amortization	33,000	66,000	172,000	303,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers	475,000	508,000	1,667,000	1,552,000
Income (loss) from operations	(115,000)	(16,000)	(235,000)	(49,000)
Income (loss) before tax	(127,000)	(25,000)	(266,000)	(79,000)
Total Assets	2,661,000	2,568,000	2,661,000	2,568,000
Capital expenditures	40,000	15,000	43,000	43,000
Depreciation & Amortization	$ 33,000	$ 32,000	$ 99,000	$ 96,000