Note 12 - Segment Information - Segment Reporting Information (Details) (USD $)	3 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Net Sales from external customers	$ 7,289,129us-gaap_SalesRevenueNet	$ 6,237,336us-gaap_SalesRevenueNet
Income (loss) from operations	329,149us-gaap_OperatingIncomeLoss	(294,936)us-gaap_OperatingIncomeLoss
Total Assets	34,176,052us-gaap_Assets
Capital expenditures	86,528	432,032
Operating Segments [Member]
Net Sales from external customers	7,289,000	6,237,000
Income (loss) from operations	329,000	(295,000)
Income (loss) before taxes	245,000	(343,000)
Total Assets	34,176,000	33,766,000
Capital expenditures	87,000	432,000
Depreciation & Amortization	229,000	213,000
Operating Segments [Member] \| Agricultural Products [Member]
Net Sales from external customers	5,315,000	4,441,000
Income (loss) from operations	439,000	(202,000)
Income (loss) before taxes	399,000	(240,000)
Total Assets	25,519,000	25,019,000
Capital expenditures	78,000	412,000
Depreciation & Amortization	140,000	120,000
Operating Segments [Member] \| Modular Buildings [Member]
Net Sales from external customers	650,000	461,000
Income (loss) from operations	(67,000)	(127,000)
Income (loss) before taxes	(73,000)	(129,000)
Total Assets	2,884,000	2,573,000
Capital expenditures	2,000	0
Depreciation & Amortization	33,000	37,000
Operating Segments [Member] \| Pressurized Vessels [Member]
Net Sales from external customers	527,000	424,000
Income (loss) from operations	(61,000)	(32,000)
Income (loss) before taxes	(67,000)	(40,000)
Total Assets	2,607,000	2,687,000
Capital expenditures	2,000	11,000
Depreciation & Amortization	27,000	27,000
Operating Segments [Member] \| Tools [Member]
Net Sales from external customers	797,000	911,000
Income (loss) from operations	18,000	66,000
Income (loss) before taxes	(14,000)	66,000
Total Assets	3,166,000	3,488,000
Capital expenditures	5,000	9,000
Depreciation & Amortization	$ 29,000	$ 29,000

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

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The net result for the period of deducting operating expenses from operating revenues.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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