Note 13 - Segment Reporting Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015	Nov. 30, 2015
Operating Segments [Member] | Agricultural Products [Member]
Revenue from external customers	$ 4,992,000	$ 4,911,000	$ 12,757,000	$ 16,592,000
Income (loss) from operations	(116,000)	(861,000)	36,000	158,000
Income (loss) before tax	(91,000)	(1,019,000)	24,000	(83,000)
Total Assets	21,209,000	24,540,000	21,209,000	24,540,000
Capital expenditures	31,000	71,000	60,000	204,000
Depreciation & Amortization	117,000	160,000	377,000	426,000
Operating Segments [Member] | Modular Buildings [Member]
Revenue from external customers	910,000	1,103,000	3,102,000	2,162,000
Income (loss) from operations	(59,000)	45,000	154,000	(119,000)
Income (loss) before tax	(65,000)	38,000	140,000	(139,000)
Total Assets	2,887,000	2,691,000	2,887,000	2,691,000
Capital expenditures		6,000		4,000
Depreciation & Amortization	15,000	31,000	46,000	98,000
Operating Segments [Member] | Tools [Member]
Revenue from external customers	530,000	500,000	1,583,000	1,851,000
Income (loss) from operations	(42,000)	(83,000)	(123,000)	(128,000)
Income (loss) before tax	(68,000)	(91,000)	(163,000)	(173,000)
Total Assets	2,654,000	2,963,000	2,654,000	2,963,000
Capital expenditures	22,000	6,000	55,000	11,000
Depreciation & Amortization	32,000	30,000	93,000	89,000
Operating Segments [Member]
Revenue from external customers	6,431,000	6,514,000	17,442,000	20,605,000
Income (loss) from operations	(217,000)	(899,000)	67,000	(89,000)
Income (loss) before tax	(224,000)	(1,072,000)	1,000	(395,000)
Total Assets	26,750,000	30,194,000	26,750,000	30,194,000
Capital expenditures	53,000	83,000	115,000	219,000
Depreciation & Amortization	164,000	221,000	516,000	613,000
Revenue from external customers	6,431,217	6,514,327	17,441,869	20,604,932
Income (loss) from operations	(217,165)	$ (898,808)	67,372	(89,183)
Total Assets	$ 28,983,435		28,983,435		$ 31,331,608
Capital expenditures			114,376	218,367
Depreciation & Amortization			$ 516,904	$ 612,903