Note 15 - Segment Information - Segment Reporting Information (Details) (USD $)	12 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Revenue from external customers	$ 36,169,811us-gaap_SalesRevenueNet	$ 34,226,553us-gaap_SalesRevenueNet
Gross Profit	8,724,569us-gaap_GrossProfit	8,366,446us-gaap_GrossProfit
Operating Expense	7,059,731us-gaap_OperatingExpenses	6,549,306us-gaap_OperatingExpenses
Income (loss) from operations	1,664,838us-gaap_OperatingIncomeLoss	1,817,140us-gaap_OperatingIncomeLoss
Income (loss) before tax	1,303,000	2,206,000
Total Assets	32,846,342us-gaap_Assets	32,767,621us-gaap_Assets
Capital expenditures	633,000	842,000
Depreciation & Amortization	907,000	704,000
Agricultural Products [Member]
Revenue from external customers	27,952,000	28,199,000
Gross Profit	7,150,000	6,508,000
Operating Expense	5,051,000	5,275,000
Income (loss) from operations	2,099,000	1,234,000
Income (loss) before tax	1,842,000	1,718,000
Total Assets	24,587,000	23,279,000
Capital expenditures	581,000	776,000
Depreciation & Amortization	537,000	413,000
Modular Buildings [Member]
Revenue from external customers	2,965,000	3,240,000
Gross Profit	626,000	1,441,000
Operating Expense	768,000	769,000
Income (loss) from operations	(142,000)	672,000
Income (loss) before tax	(165,000)	680,000
Total Assets	2,503,000	3,092,000
Capital expenditures		20,000
Depreciation & Amortization	146,000	158,000
Pressurized Vessels [Member]
Revenue from external customers	1,736,000	2,137,000
Gross Profit	39,000	234,000
Operating Expense	351,000	360,000
Income (loss) from operations	(312,000)	(127,000)
Income (loss) before tax	(341,000)	(221,000)
Total Assets	2,548,000	2,758,000
Capital expenditures	27,000	41,000
Depreciation & Amortization	108,000	105,000
Tools [Member]
Revenue from external customers	3,517,000	651,000
Gross Profit	910,000	183,000
Operating Expense	890,000	145,000
Income (loss) from operations	20,000	38,000
Income (loss) before tax	(33,000)	29,000
Total Assets	3,210,000	3,639,000
Capital expenditures	25,000	5,000
Depreciation & Amortization	$ 116,000	$ 28,000

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

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-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Article 7

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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-Paragraph 28

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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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

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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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

-Name Accounting Standards Codification

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