Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Sales	$ 4,421,168	$ 5,712,681
Cost of goods sold	3,307,345	4,084,798
Gross profit	1,113,823	1,627,883
Expenses:
Engineering	132,640	99,416
Selling	485,380	464,913
General and administrative	848,236	842,586
Total expenses	1,466,256	1,406,915
Income (Loss) from operations	(352,433)	220,968
Other income (expense):
Interest expense	(63,794)	(67,839)
Other	51,674	42,187
Total other income (expense)	(12,120)	(25,652)
Income (Loss) from continuing operations before income taxes	(364,553)	195,316
Income tax expense (benefit)	(110,911)	61,767
Income (Loss) from continuing operations	(253,642)	133,549
Discontinued Operations
Income (loss) from operations of discontinued segment	4,877	(75,124)
Income tax expense (benefit)	1,264	(22,537)
Income (Loss) on discontinued operations	3,613	(52,587)
Net Income (Loss)	$ (250,029)	$ 80,962
Earnings (Loss) per share - Basic:
Continuing Operations (in dollars per share)	$ (0.06)	$ 0.03
Discontinued Operations (in dollars per share)	0	(0.01)
Net Income (Loss) per share (in dollars per share)	(0.06)	0.02
Earnings (Loss) per share - Diluted:
Continuing Operations (in dollars per share)	(0.06)	0.03
Discontinued Operations (in dollars per share)	0	(0.01)
Net Income (Loss) per share (in dollars per share)	$ (0.06)	$ 0.02
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,126,012	4,074,338
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,126,012	4,074,338