Note 12 - Segment Reporting Information (Details) - USD ($)	3 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers	$ 4,198,000	$ 5,315,000
Income (loss) from operations	248,000	439,000
Income (loss) before tax	233,000	399,000
Total Assets	21,844,000	25,519,000
Capital expenditures	4,000	78,000
Depreciation & Amortization	128,000	140,000
Operating Segments [Member] | Pressurized Vessels [Member]
Revenue from external customers	679,000	527,000
Income (loss) from operations	(72,000)	(61,000)
Income (loss) before tax	(75,000)	(67,000)
Total Assets	2,580,000	2,607,000
Capital expenditures	8,000	2,000
Depreciation & Amortization	29,000	27,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers	943,000	650,000
Income (loss) from operations	9,000	(67,000)
Income (loss) before tax	7,000	(73,000)
Total Assets	$ 2,838,000	$ 2,884,000
Capital expenditures
Depreciation & Amortization	$ 15,000	$ 33,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers	572,000	797,000
Income (loss) from operations	(36,000)	18,000
Income (loss) before tax	(44,000)	(14,000)
Total Assets	2,736,000	3,166,000
Capital expenditures	23,000	5,000
Depreciation & Amortization	30,000	29,000
Operating Segments [Member]
Revenue from external customers	6,392,000	7,289,000
Income (loss) from operations	149,000	329,000
Income (loss) before tax	121,000	245,000
Total Assets	29,998,000	34,176,000
Capital expenditures	35,000	87,000
Depreciation & Amortization	202,000	229,000
Revenue from external customers	6,391,997	7,289,129
Income (loss) from operations	149,226	329,149
Income (loss) before tax	120,192	244,800
Total Assets	29,998,243
Capital expenditures	34,694	86,528
Depreciation & Amortization	$ 202,013	$ 229,454