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Note 16 - Segment Information - Segment Reporting Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Nov. 30, 2020
Revenue from external customers $ 5,710,228 $ 5,445,732 $ 11,110,800 $ 10,471,656  
Income (loss) from operations 148,781 (924,616) (219,742) (1,394,313)  
Total Assets 20,670,260   20,670,260   $ 18,803,013
Capital expenditures     318,958 412,294  
Depreciation & Amortization     308,267 459,436  
Operating Segments [Member]          
Revenue from external customers [1] 5,710,000 5,446,000 11,111,000 10,472,000  
Income (loss) from operations [1] 149,000 (925,000) (220,000) (1,394,000)  
Income (loss) before tax [1] 81,000 (997,000) (319,000) (1,541,000)  
Total Assets [1] 20,670,000 20,380,000 20,670,000 20,380,000  
Capital expenditures [1] 155,000 141,000 319,000 412,000  
Depreciation & Amortization [1] 147,000 231,000 308,000 459,000  
Operating Segments [Member] | Agricultural Products [Member]          
Revenue from external customers 3,858,000 3,071,000 7,357,000 6,023,000  
Income (loss) from operations 188,000 (722,000) (9,000) (1,156,000)  
Income (loss) before tax 137,000 (784,000) (76,000) (1,282,000)  
Total Assets 14,271,000 13,948,000 14,271,000 13,948,000  
Capital expenditures 155,000 56,000 310,000 298,000  
Depreciation & Amortization 87,000 127,000 185,000 254,000  
Operating Segments [Member] | Modular Buildings [Member]          
Revenue from external customers 1,194,000 1,799,000 2,485,000 3,256,000  
Income (loss) from operations (21,000) (124,000) (187,000) (118,000)  
Income (loss) before tax (28,000) (126,000) (199,000) (120,000)  
Total Assets 3,725,000 3,772,000 3,725,000 3,772,000  
Capital expenditures 85,000 9,000 111,000  
Depreciation & Amortization 27,000 71,000 56,000 139,000  
Operating Segments [Member] | Tools [Member]          
Revenue from external customers 658,000 576,000 1,269,000 1,193,000  
Income (loss) from operations (18,000) (79,000) (24,000) (120,000)  
Income (loss) before tax (28,000) (87,000) (44,000) (139,000)  
Total Assets 2,674,000 2,660,000 2,674,000 2,660,000  
Capital expenditures 3,000  
Depreciation & Amortization $ 33,000 $ 33,000 $ 67,000 $ 66,000  
[1] The consolidated total in the tables is a sum of segment figures and may not tie to actual figures in the condensed consolidated financial statements due to rounding.