Export Sales (Details) - USD ($)	3 Months Ended
	Feb. 29, 2020	Feb. 28, 2019
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	$ 636,417	$ 1,092,398
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	1,153,406	1,513,169
Other Asian Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	214,762	445,435
South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	115,022	81,621
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	$ 283,762	$ 326,913