Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Sales	$ 5,365,536	$ 4,421,168
Cost of goods sold	4,245,729	3,307,345
Gross profit	1,119,807	1,113,823
Expenses:
Engineering	129,064	132,640
Selling	450,961	485,380
General and administrative	848,503	848,236
Total expenses	1,428,528	1,466,256
Income (Loss) from operations	(308,721)	(352,433)
Other income (expense):
Interest expense	(69,676)	(63,794)
Other	72,572	51,674
Total other income (expense)	2,896	(12,120)
Income (Loss) from continuing operations before income taxes	(305,825)	(364,553)
Income tax expense (benefit)	221,573	(110,911)
Income (Loss) from continuing operations	(527,398)	(253,642)
Discontinued Operations
Income (loss) from operations of discontinued segment	(51,590)	4,877
Income tax expense (benefit)	(12,536)	1,264
Income (Loss) on discontinued operations	(39,054)	3,613
Net Income (Loss)	$ (566,452)	$ (250,029)
Earnings (Loss) per share - Basic:
Continuing Operations (in dollars per share)	$ (0.13)	$ (0.06)
Discontinued Operations (in dollars per share)	(0.01)	0
Net Income (Loss) per share (in dollars per share)	(0.14)	(0.06)
Earnings (Loss) per share - Diluted:
Continuing Operations (in dollars per share)	(0.13)	(0.06)
Discontinued Operations (in dollars per share)	(0.01)	0
Net Income (Loss) per share (in dollars per share)	$ (0.14)	$ (0.06)
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,170,818	4,126,012
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,170,818	4,126,012