Note 12 - Segment Reporting Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015	Nov. 30, 2015
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers	$ 3,567,000	$ 6,365,000	$ 7,765,000	$ 11,681,000
Income (loss) from operations	(96,000)	579,000	152,000	1,018,000
Income (loss) before tax	(118,000)	538,000	115,000	937,000
Total Assets	20,415,000	25,330,000	20,415,000	25,330,000
Capital expenditures	25,000	55,000	29,000	133,000
Depreciation & Amortization	132,000	126,000	260,000	262,000
Capital expenditures	(25,000)	(55,000)	(29,000)	(133,000)
Operating Segments [Member] | Pressurized Vessels [Member]
Revenue from external customers	443,000	476,000	1,122,000	1,003,000
Income (loss) from operations	(97,000)	(5,000)	(169,000)	(66,000)
Income (loss) before tax	(105,000)	(11,000)	(180,000)	(78,000)
Total Assets	2,306,000	2,765,000	2,306,000	2,765,000
Capital expenditures			8,000	2,000
Depreciation & Amortization	29,000	29,000	58,000	53,000
Capital expenditures			(8,000)	(2,000)
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers	1,250,000	409,000	2,193,000	1,058,000
Income (loss) from operations	203,000	(97,000)	212,000	(164,000)
Income (loss) before tax	199,000	(104,000)	206,000	(177,000)
Total Assets	2,626,000	2,659,000	2,626,000	2,659,000
Capital expenditures		2,000
Depreciation & Amortization	16,000	52,000	31,000	85,000
Capital expenditures		(2,000)
Operating Segments [Member] | Tools [Member]
Revenue from external customers	481,000	554,000	1,053,000	1,351,000
Income (loss) from operations	(43,000)	(63,000)	(79,000)	(45,000)
Income (loss) before tax	(51,000)	(69,000)	(95,000)	(83,000)
Total Assets	2,648,000	3,034,000	2,648,000	3,034,000
Capital expenditures	10,000	5,000	33,000	5,000
Depreciation & Amortization	31,000	30,000	61,000	59,000
Capital expenditures	(10,000)	(5,000)	(33,000)	(5,000)
Operating Segments [Member]
Revenue from external customers	5,741,000	7,804,000	12,133,000	15,093,000
Income (loss) from operations	(33,000)	414,000	116,000	743,000
Income (loss) before tax	(75,000)	354,000	46,000	599,000
Total Assets	27,995,000	33,788,000	27,995,000	33,788,000
Capital expenditures	35,000	58,000	70,000	140,000
Depreciation & Amortization	208,000	237,000	410,000	459,000
Capital expenditures	(35,000)	(58,000)	(70,000)	(140,000)
Revenue from external customers	5,741,088	7,804,111	12,133,086	15,093,239
Income (loss) from operations	(33,051)	414,144	116,186	743,293
Income (loss) before tax	(75,459)	$ 354,007	44,745	598,807
Total Assets	$ 27,995,262		27,995,262		$ 31,331,608
Capital expenditures			69,662	139,994
Depreciation & Amortization			409,614	459,412
Capital expenditures			$ (69,662)	$ (139,994)