Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Sales	$ 5,294,464	$ 4,689,354	$ 10,660,000	$ 9,110,522
Cost of goods sold	4,187,450	3,877,870	8,399,610	7,185,215
Gross profit	1,107,014	811,484	2,260,390	1,925,307
Expenses:
Engineering	127,539	132,347	256,602	264,987
Selling	487,991	483,060	972,522	968,441
General and administrative	949,598	917,461	1,798,101	1,765,695
Total expenses	1,565,128	1,532,868	3,027,225	2,999,123
Income (Loss) from operations	(458,114)	(721,384)	(766,835)	(1,073,816)
Other income (expense):
Interest expense	(68,711)	(79,253)	(138,387)	(143,047)
Other	(252,687)	63,245	(180,115)	114,920
Total other income (expense)	(321,398)	(16,008)	(318,502)	(28,127)
Income (Loss) from continuing operations before income taxes	(779,512)	(737,392)	(1,085,337)	(1,101,943)
Income tax expense (benefit)	(125,533)	(228,485)	96,040	(339,396)
Income (Loss) from continuing operations	(653,979)	(508,907)	(1,181,377)	(762,547)
Discontinued Operations
Income (loss) from operations of discontinued segment	(15,587)	(27,665)	(67,177)	(22,789)
Income tax expense (benefit)	(3,788)	(9,012)	(16,324)	(7,748)
Income (Loss) on discontinued operations	(11,799)	(18,653)	(50,853)	(15,041)
Net Income (Loss)	$ (665,778)	$ (527,560)	$ (1,232,230)	$ (777,588)
Earnings (Loss) per share - Basic:
Continuing Operations (in dollars per share)	$ (0.16)	$ (0.12)	$ (0.28)	$ (0.18)
Discontinued Operations (in dollars per share)			(0.01)
Net Income (Loss) per share (in dollars per share)	(0.16)	(0.12)	(0.29)	(0.18)
Earnings (Loss) per share - Diluted:
Continuing Operations (in dollars per share)	(0.16)	(0.12)	(0.28)	(0.18)
Discontinued Operations (in dollars per share)			(0.01)
Net Income (Loss) per share (in dollars per share)	$ (0.16)	$ (0.12)	$ (0.29)	$ (0.18)
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,213,893	4,158,969	4,192,592	4,142,672
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,213,893	4,158,969	4,192,592	4,142,672