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Note 16 - Segment Reporting Information (Details) - USD ($) | 12 Months Ended
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Nov. 30, 2015 | Nov. 30, 2014
Operating Segments [Member] | Agricultural Products [Member] |  |
Revenue from external customers | $ 20,756,000 | $ 27,952,000
Gross Profit | 5,310,000 | 7,150,000
Operating Expense | 5,394,000 | 5,051,000
Income (loss) from operations | (84,000) | 2,099,000
Income (loss) before tax | (438,000) | 1,842,000
Total Assets | 22,696,000 | 24,585,000
Capital expenditures | 219,000 | 581,000
Depreciation & Amortization | 585,000 | 537,000
Operating Segments [Member] | Pressurized Vessels [Member] |  |
Revenue from external customers | 1,610,000 | 1,736,000
Gross Profit | 72,000 | 39,000
Operating Expense | 399,000 | 351,000
Income (loss) from operations | (327,000) | (312,000)
Income (loss) before tax | (354,000) | (341,000)
Total Assets | 2,565,000 | 2,548,000
Capital expenditures | 54,000 | 27,000
Depreciation & Amortization | 107,000 | 108,000
Operating Segments [Member] | Modular Buildings [Member] |  |
Revenue from external customers | 3,191,000 | 2,965,000
Gross Profit | 970,000 | 626,000
Operating Expense | 820,000 | 768,000
Income (loss) from operations | 150,000 | (142,000)
Income (loss) before tax | 124,000 | (165,000)
Total Assets | 3,181,000 | $ 2,503,000
Capital expenditures | 9,000 |
Depreciation & Amortization | 125,000 | $ 146,000
Operating Segments [Member] | Tools [Member] |  |
Revenue from external customers | 2,379,000 | 3,517,000
Gross Profit | 632,000 | 910,000
Operating Expense | 775,000 | 890,000
Income (loss) from operations | (143,000) | 20,000
Income (loss) before tax | (197,000) | (33,000)
Total Assets | 2,890,000 | 3,210,000
Capital expenditures | 11,000 | 25,000
Depreciation & Amortization | 119,000 | 116,000
Operating Segments [Member] |  |
Revenue from external customers | 27,936,000 | 36,170,000
Gross Profit | 6,984,000 | 8,725,000
Operating Expense | 7,388,000 | 7,060,000
Income (loss) from operations | (404,000) | 1,665,000
Income (loss) before tax | (865,000) | 1,303,000
Total Assets | 31,332,000 | 32,846,000
Capital expenditures | 293,000 | 633,000
Depreciation & Amortization | 936,000 | 907,000
Revenue from external customers | 27,935,791 | 36,169,811
Gross Profit | 6,983,682 | 8,724,569
Operating Expense | 7,387,345 | 7,059,731
Income (loss) from operations | (403,663) | 1,664,838
Income (loss) before tax | (865,062) | 1,302,505
Total Assets | 31,331,608 | 32,846,342
Capital expenditures | $ 292,543 | $ 633,078

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