Export Sales (Details) - USD ($)	3 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	$ 1,513,169	$ 1,000,865
Elsewhere In Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	445,435	303,530
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	326,913	224,315
South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	81,621	123,335
stpr:CA
Revenues from External Customers and Long-Lived Assets [Line Items]
Export sales	$ 1,092,398	$ 840,641