Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
Sales	$ 4,124,226	$ 5,365,536
Cost of goods sold	3,519,382	4,245,729
Gross profit	604,844	1,119,807
Expenses:
Engineering	147,214	129,064
Selling	343,349	450,961
General and administrative	836,906	848,503
Total expenses	1,327,469	1,428,528
Income (Loss) from operations	(722,625)	(308,721)
Other income (expense):
Interest expense	(85,039)	(69,676)
Other	26,824	72,572
Total other income (expense)	(58,215)	2,896
Income (Loss) from continuing operations before income taxes	(780,840)	(305,825)
Income tax expense (benefit)	(174,908)	221,573
Income (Loss) from continuing operations	(605,932)	(527,398)
Discontinued Operations
Income (loss) from operations of discontinued segment		(51,590)
Income tax expense (benefit)		(12,536)
Income (Loss) on discontinued operations		(39,054)
Net Income (Loss)	$ (605,932)	$ (566,452)
Net Income (Loss) per share - Basic:
Continuing Operations (in dollars per share)	$ (0.14)	$ (0.13)
Discontinued Operations (in dollars per share)		(0.01)
Net Income (Loss) per share (in dollars per share)	(0.14)	(0.14)
Net Income (Loss) per share - Diluted:
Continuing Operations (in dollars per share)	(0.14)	(0.13)
Discontinued Operations (in dollars per share)		(0.01)
Net Income (Loss) per share (in dollars per share)	$ (0.14)	$ (0.14)
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,243,707	4,170,818
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,243,707	4,170,818