Note 17 - Segment Information - Segment Reporting Information (Details) - USD ($)	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Nov. 30, 2020
Revenue from external customers	$ 5,400,572	$ 5,025,924
Income (loss) from operations	(368,523)	(469,696)
Total Assets	18,781,770		$ 18,803,013
Capital expenditures	163,927	267,141
Depreciation & Amortization	161,107	227,456
Operating Segments [Member]
Revenue from external customers	5,401,000	5,026,000
Income (loss) from operations	(369,000)	(470,000)
Income (loss) before tax	(400,000)	(544,000)
Total Assets	18,782,000	21,000,000
Capital expenditures	164,000	267,000
Depreciation & Amortization	161,000	227,000
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers	3,500,000	2,953,000
Income (loss) from operations	(198,000)	(435,000)
Income (loss) before tax	(212,000)	(498,000)
Total Assets	12,990,000	13,870,000
Capital expenditures	155,000	241,000
Depreciation & Amortization	99,000	126,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers	1,291,000	1,457,000
Income (loss) from operations	(165,000)	6,000
Income (loss) before tax	(172,000)	6,000
Total Assets	3,171,000	4,373,000
Capital expenditures	9,000	26,000
Depreciation & Amortization	29,000	68,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers	610,000	616,000
Income (loss) from operations	(6,000)	(41,000)
Income (loss) before tax	(16,000)	(52,000)
Total Assets	2,621,000	2,757,000
Capital expenditures
Depreciation & Amortization	$ 33,000	$ 33,000