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Note 16 - Segment Information (Details) - Segment Reporting Information (USD $) | 12 Months Ended
--- | ---
Nov. 30, 2013 | Nov. 30, 2012
Segment Reporting Information [Line Items] |  |
Revenue from external customers | $ 34,226,553 | $ 36,456,830
Gross Profit | 8,366,446 | 10,032,263
Operating Expense | 6,549,306 | 5,704,438
Income (loss) from operations | 1,551,376 | 2,665,087
Income (loss) before tax | 2,206,000 | 3,988,000
Total Assets | 32,767,621 | 31,228,676
Capital expenditures | 842,000 | 800,000
Depreciation & Amortization | 704,000 | 853,000
External [Member] | Agricultural Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue from external customers | 28,199,000 | 24,720,000
External [Member] | Pressurized Vessels [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue from external customers | 2,137,000 | 2,092,000
External [Member] | Modular Buildings [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue from external customers | 3,240,000 | 9,645,000
External [Member] | Tools [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue from external customers | 651,000 |
External [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue from external customers | 34,227,000 | 36,457,000
Agricultural Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross Profit | 6,508,000 | 6,945,000
Operating Expense | 5,275,000 | 4,572,000
Income (loss) from operations | 1,234,000 | 2,373,000
Income (loss) before tax | 1,718,000 | 2,326,000
Total Assets | 23,279,000 | 24,155,000
Capital expenditures | 776,000 | 753,000
Depreciation & Amortization | 413,000 | 531,000
Pressurized Vessels [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross Profit | 234,000 | 146,000
Operating Expense | 360,000 | 273,000
Income (loss) from operations | (127,000) | (127,000)
Income (loss) before tax | (221,000) | (355,000)
Total Assets | 2,758,000 | 2,846,000
Capital expenditures | 41,000 | 14,000
Depreciation & Amortization | 105,000 | 113,000
Modular Buildings [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross Profit | 1,441,000 | 2,941,000
Operating Expense | 769,000 | 859,000
Income (loss) from operations | 672,000 | 2,082,000
Income (loss) before tax | 680,000 | 2,017,000
Total Assets | 3,092,000 | 4,228,000
Capital expenditures | 20,000 | 33,000
Depreciation & Amortization | 158,000 | 209,000
Tools [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross Profit | 183,000 |
Operating Expense | 145,000 |
Income (loss) from operations | 38,000 |
Income (loss) before tax | 29,000 |
Total Assets | 3,639,000 |
Capital expenditures | 5,000 |
Depreciation & Amortization | $ 28,000 |

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