Note 16 - Segment Information (Details) - Segment Reporting Information (USD $)	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Segment Reporting Information [Line Items]
Revenue from external customers	$ 34,226,553	$ 36,456,830
Gross Profit	8,366,446	10,032,263
Operating Expense	6,549,306	5,704,438
Income (loss) from operations	1,551,376	2,665,087
Income (loss) before tax	2,206,000	3,988,000
Total Assets	32,767,621	31,228,676
Capital expenditures	842,000	800,000
Depreciation & Amortization	704,000	853,000
External [Member] | Agricultural Products [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	28,199,000	24,720,000
External [Member] | Pressurized Vessels [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	2,137,000	2,092,000
External [Member] | Modular Buildings [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	3,240,000	9,645,000
External [Member] | Tools [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	651,000
External [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	34,227,000	36,457,000
Agricultural Products [Member]
Segment Reporting Information [Line Items]
Gross Profit	6,508,000	6,945,000
Operating Expense	5,275,000	4,572,000
Income (loss) from operations	1,234,000	2,373,000
Income (loss) before tax	1,718,000	2,326,000
Total Assets	23,279,000	24,155,000
Capital expenditures	776,000	753,000
Depreciation & Amortization	413,000	531,000
Pressurized Vessels [Member]
Segment Reporting Information [Line Items]
Gross Profit	234,000	146,000
Operating Expense	360,000	273,000
Income (loss) from operations	(127,000)	(127,000)
Income (loss) before tax	(221,000)	(355,000)
Total Assets	2,758,000	2,846,000
Capital expenditures	41,000	14,000
Depreciation & Amortization	105,000	113,000
Modular Buildings [Member]
Segment Reporting Information [Line Items]
Gross Profit	1,441,000	2,941,000
Operating Expense	769,000	859,000
Income (loss) from operations	672,000	2,082,000
Income (loss) before tax	680,000	2,017,000
Total Assets	3,092,000	4,228,000
Capital expenditures	20,000	33,000
Depreciation & Amortization	158,000	209,000
Tools [Member]
Segment Reporting Information [Line Items]
Gross Profit	183,000
Operating Expense	145,000
Income (loss) from operations	38,000
Income (loss) before tax	29,000
Total Assets	3,639,000
Capital expenditures	5,000
Depreciation & Amortization	$ 28,000