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Export Sales (Tables)
3 Months Ended
Feb. 29, 2020
Segment Reporting [Abstract]  
Schedule of export sales
   Three Months Ended 
   February 29,   February 28, 
   2020   2019 
Canada   636,417    1,092,398 
China   1,153,406    1,513,169 
Other Asian Countries   214,762    445,435 
South America   115,022    81,621 
Europe   283,762    326,913