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Export Sales (Tables)
 9 Months Ended
Aug. 31, 2020
Segment Reporting [Abstract]  
Schedule of export sales
   Nine Months Ended 
   August 31,   August 31, 
   2020   2019 
Canada   2,945,773    3,311,535 
China   3,948,811    4,240,122 
Other Asian Countries   1,099,040    1,811,454 
South America   143,928    394,140 
Europe   843,747    931,916