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Note 12 - Segment Information (Details) - Segment reporting information (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2013 | May 31, 2012 | May 31, 2013 | May 31, 2012 | Nov. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from external customers | $ 9,250,308 | $ 11,685,169 | $ 17,665,413 | $ 17,997,383 |
Income (loss) from operations | 798,959 | 1,493,766 | 1,511,713 | 1,856,021 |
Income (loss) before tax | 709,777 | 1,404,478 | 1,971,210 | 1,693,556 |
Total Assets | 31,445,515 | 35,115,000 | 31,445,515 | 35,115,000 | 31,228,676
Capital expenditures | 66,000 | 1,561,000 | 210,000 | 1,667,000 |
Depreciation & Amortization | 171,000 | 203,000 | 370,000 | 408,000 |
Agricultural Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from external customers | 7,716,000 | 8,006,000 | 14,720,000 | 11,994,000 |
Income (loss) from operations | 568,000 | 1,038,000 | 1,129,000 | 1,174,000 |
Income (loss) before tax | 517,000 | 1,024,000 | 1,693,000 | 1,161,000 |
Total Assets | 25,531,000 | 25,014,000 | 25,531,000 | 25,014,000 |
Capital expenditures | 58,000 | 1,563,000 | 197,000 | 1,640,000 |
Depreciation & Amortization | 96,000 | 121,000 | 247,000 | 245,000 |
Pressurized Vessels [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from external customers | 642,000 | 617,000 | 1,036,000 | 946,000 |
Income (loss) from operations | (12,000) | (30,000) | (135,000) | (118,000) |
Income (loss) before tax | (38,000) | (87,000) | (214,000) | (231,000) |
Total Assets | 2,891,000 | 2,791,000 | 2,891,000 | 2,791,000 |
Capital expenditures | 5,000 | (9,000) | 9,000 | 5,000 |
Depreciation & Amortization | 26,000 | 29,000 | 52,000 | 57,000 |
Modular Buildings [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from external customers | 892,000 | 3,062,000 | 1,909,000 | 5,057,000 |
Income (loss) from operations | 243,000 | 485,000 | 518,000 | 800,000 |
Income (loss) before tax | 231,000 | 468,000 | 492,000 | 763,000 |
Total Assets | 3,024,000 | 7,310,000 | 3,024,000 | 7,310,000 |
Capital expenditures | 3,000 | 7,000 | 4,000 | 22,000 |
Depreciation & Amortization | $ 49,000 | $ 53,000 | $ 71,000 | $ 106,000 |

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- Definition 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. + References 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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