Note 12 - Segment Information (Details) - Segment Reporting Information (USD $)	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2013	Nov. 30, 2013
Segment Reporting Information [Line Items]
Revenue from external customers		$ 6,237,336	$ 8,415,000	$ 8,415,104
Income (loss) from operations		(294,936)	713,000	712,748
Income (loss) before tax		(343,200)	1,261,000	1,261,427
Total Assets	33,765,643	33,765,643	32,732,000	32,732,000	32,767,621
Capital expenditures	432,000	432,032	144,000	144,325
Depreciation & Amortization	213,000	212,989	199,000	198,753
Agricultural Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		4,441,000	7,004,000
Income (loss) from operations		(203,000)	561,000
Income (loss) before tax		(240,000)	1,176,000
Total Assets	25,019,000	25,019,000	26,697,000	26,697,000
Capital expenditures	412,000		139,000
Depreciation & Amortization	120,000		151,000
Pressurized Vessels [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		424,000	394,000
Income (loss) from operations		(31,000)	(123,000)
Income (loss) before tax		(40,000)	(176,000)
Total Assets	2,687,000	2,687,000	2,707,000	2,707,000
Capital expenditures	11,000		4,000
Depreciation & Amortization	27,000		26,000
Modular Buildings [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		461,000	1,017,000
Income (loss) from operations		(127,000)	275,000
Income (loss) before tax		(129,000)	261,000
Total Assets	2,572,000	2,572,000	3,328,000	3,328,000
Capital expenditures	0		1,000
Depreciation & Amortization	37,000		22,000
Tools [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		911,000	0
Income (loss) from operations		66,000	0
Income (loss) before tax		66,000	0
Total Assets	3,488,000	3,488,000	0	0
Capital expenditures	9,000		0
Depreciation & Amortization	$ 29,000		$ 0