Note 16 - Segment Reporting Information (Details) - USD ($)	12 Months Ended
	Nov. 30, 2015	Nov. 30, 2014
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers	$ 20,756,000	$ 27,952,000
Gross Profit	5,310,000	7,150,000
Operating Expense	5,394,000	5,051,000
Income (loss) from operations	(84,000)	2,099,000
Income (loss) before tax	(438,000)	1,842,000
Total Assets	22,696,000	24,585,000
Capital expenditures	219,000	581,000
Depreciation & Amortization	585,000	537,000
Operating Segments [Member] | Pressurized Vessels [Member]
Revenue from external customers	1,610,000	1,736,000
Gross Profit	72,000	39,000
Operating Expense	399,000	351,000
Income (loss) from operations	(327,000)	(312,000)
Income (loss) before tax	(354,000)	(341,000)
Total Assets	2,565,000	2,548,000
Capital expenditures	54,000	27,000
Depreciation & Amortization	107,000	108,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers	3,191,000	2,965,000
Gross Profit	970,000	626,000
Operating Expense	820,000	768,000
Income (loss) from operations	150,000	(142,000)
Income (loss) before tax	124,000	(165,000)
Total Assets	3,181,000	$ 2,503,000
Capital expenditures	9,000
Depreciation & Amortization	125,000	$ 146,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers	2,379,000	3,517,000
Gross Profit	632,000	910,000
Operating Expense	775,000	890,000
Income (loss) from operations	(143,000)	20,000
Income (loss) before tax	(197,000)	(33,000)
Total Assets	2,890,000	3,210,000
Capital expenditures	11,000	25,000
Depreciation & Amortization	119,000	116,000
Operating Segments [Member]
Revenue from external customers	27,936,000	36,170,000
Gross Profit	6,984,000	8,725,000
Operating Expense	7,388,000	7,060,000
Income (loss) from operations	(404,000)	1,665,000
Income (loss) before tax	(865,000)	1,303,000
Total Assets	31,332,000	32,846,000
Capital expenditures	293,000	633,000
Depreciation & Amortization	936,000	907,000
Revenue from external customers	27,935,791	36,169,811
Gross Profit	6,983,682	8,724,569
Operating Expense	7,387,345	7,059,731
Income (loss) from operations	(403,663)	1,664,838
Income (loss) before tax	(865,062)	1,302,505
Total Assets	31,331,608	32,846,342
Capital expenditures	$ 292,543	$ 633,078