Note 13 - Segment Information - Segment Reporting Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016	Nov. 30, 2016
Total Assets		$ 26,491,778		$ 26,491,778		$ 27,242,590
Capital expenditures				472,031	$ 114,376
Depreciation & Amortization				516,642	516,904
Revenue from external customers		6,549,772	$ 6,431,217	15,660,294	17,441,869
Income (loss) from operations		109,240	(217,165)	(964,576)	67,372
Operating Segments [Member]
Income (loss) before tax	[1]	93,000	(224,000)	(1,010,000)	1,000
Total Assets	[1]	24,756,000	26,750,000	24,756,000	26,750,000
Capital expenditures	[1]	178,000	53,000	472,000	115,000
Depreciation & Amortization	[1]	174,000	164,000	513,000	516,000
Revenue from external customers	[1]	6,550,000	6,432,000	15,660,000	17,442,000
Income (loss) from operations	[1]	109,000	(217,000)	(964,000)	67,000
Operating Segments [Member] | Agricultural Products [Member]
Income (loss) before tax	[1]	123,000	(91,000)	(743,000)	24,000
Total Assets	[1]	18,941,000	21,209,000	18,941,000	21,209,000
Capital expenditures	[1]	61,000	31,000	265,000	60,000
Depreciation & Amortization	[1]	125,000	117,000	372,000	377,000
Revenue from external customers	[1]	5,065,000	4,992,000	11,595,000	12,757,000
Income (loss) from operations	[1]	118,000	(116,000)	(758,000)	36,000
Operating Segments [Member] | Modular Buildings [Member]
Income (loss) before tax	[1]	(45,000)	(65,000)	(237,000)	140,000
Total Assets	[1]	3,094,000	2,887,000	3,094,000	2,887,000
Capital expenditures	[1]	117,000		117,000
Depreciation & Amortization	[1]	17,000	15,000	46,000	46,000
Revenue from external customers	[1]	767,000	910,000	2,043,000	3,102,000
Income (loss) from operations	[1]	(37,000)	(59,000)	(209,000)	154,000
Operating Segments [Member] | Tools [Member]
Income (loss) before tax	[1]	15,000	(68,000)	(30,000)	(163,000)
Total Assets	[1]	2,721,000	2,654,000	2,721,000	2,654,000
Capital expenditures	[1]		22,000	90,000	55,000
Depreciation & Amortization	[1]	32,000	32,000	95,000	93,000
Revenue from external customers	[1]	718,000	530,000	2,022,000	1,583,000
Income (loss) from operations	[1]	$ 28,000	$ (42,000)	$ 3,000	$ (123,000)

[1] Segment figures in the table may not sum to the consolidated total due to rounding.