Major Suppliers (Details)	9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Major Suppliers (Details) [Line Items]
Number of foreign supplier	1	1
Supplier Concentration Risk [Member] | Major Suppliers [Member] | Total Inventory Purchased [Member]
Major Suppliers (Details) [Line Items]
Percentage of inventory purchased of products	39.00%	39.00%
Supplier Concentration Risk [Member] | Taiwan [Member] | Total Inventory Purchased [Member]
Major Suppliers (Details) [Line Items]
Percentage of inventory purchased of products	45.00%
Supplier Concentration Risk [Member] | Hong Kong [Member] | Total Inventory Purchased [Member]
Major Suppliers (Details) [Line Items]
Percentage of inventory purchased of products	16.00%
Supplier Concentration Risk [Member] | Elsewhere in Asia [Member] | Total Inventory Purchased [Member]
Major Suppliers (Details) [Line Items]
Percentage of inventory purchased of products	25.00%
Supplier Concentration Risk [Member] | Overseas Outside of Asia [Member] | Total Inventory Purchased [Member]
Major Suppliers (Details) [Line Items]
Percentage of inventory purchased of products	1.00%