Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Feb. 29, 2020	Feb. 28, 2019
Sales	$ 5,025,924	$ 4,124,226
Cost of goods sold	4,048,762	3,519,382
Gross profit	977,162	604,844
Expenses:
Engineering	109,852	147,214
Selling	455,684	343,349
General and administrative	881,322	836,906
Total expenses	1,446,858	1,327,469
Income (Loss) from operations	(469,696)	(722,625)
Other income (expense):
Interest expense	(83,274)	(85,039)
Other	9,199	26,824
Total other income (expense)	(74,075)	(58,215)
Income (Loss) before income taxes	(543,771)	(780,840)
Income tax expense (benefit)	(106,579)	(174,908)
Net Income (Loss)	$ (437,192)	$ (605,932)
Net Income (Loss) per share
Net Income (Loss) per share (in dollars per share)	$ (0.10)	$ (0.14)
Diluted Net Income (Loss) per share (in dollars per share)	$ (0.10)	$ (0.14)
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,315,481	4,243,707
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,315,481	4,243,707