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Note 17 - Segment Information (Tables)
12 Months Ended
Nov. 30, 2012
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
12 Months Ended November 30, 2012
 
   
Agricultural Products
   
Pressurized Vessels
   
Modular Buildings
 
Consolidated
 
Revenue from external customers
  $ 24,720,000     $ 2,092,000     $ 9,645,000     $ 36,457,000  
Gross Profit
    6,945,000       146,000       2,941,000       10,032,000  
Operating Expense
    4,572,000       273,000       859,000       5,704,000  
Income (loss) from operations
    2,373,000       (127,000 )     2,082,000       4,328,000  
Income (loss) before tax
    2,326,000       (355,000 )     2,017,000       3,988,000  
Total Assets
    24,155,000       2,846,000       4,228,000       31,229,000  
Capital expenditures
    753,000       14,000       33,000       800,000  
Depreciation & Amortization
    531,000       113,000       209,000       853,000  
                                 
   
12 Months Ended November 30, 2011
 
   
Agricultural Products
   
Pressurized Vessels
   
Modular Buildings
 
Consolidated
 
Revenue from external customers
  $ 22,614,000     $ 1,797,000     $ 3,209,000     $ 27,620,000  
Gross Profit
    6,481,000       (112,000 )     638,000       7,007,000  
Operating Expense
    4,053,000       336,000       688,000       5,077,000  
Income (loss) from operations
    2,428,000       (448,000 )     (50,000 )     1,930,000  
Income (loss) before tax
    2,378,000       (674,000 )     (123,000 )     1,581,000  
Total Assets
    19,965,000       2,768,000       3,122,000       25,855,000  
Capital expenditures
    569,000       100,000       423,000       1,092,000  
Depreciation & Amortization
    469,000       105,000       206,000       780,000