Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Sales	$ 6,549,772	$ 6,431,217	$ 15,660,294	$ 17,441,869
Cost of goods sold	5,104,826	5,189,532	12,290,041	13,088,340
Gross profit	1,444,946	1,241,685	3,370,253	4,353,529
Expenses:
Engineering	107,944	123,653	372,932	314,794
Selling	432,562	456,037	1,401,003	1,352,875
General and administrative	795,200	879,160	2,560,894	2,618,488
Total expenses	1,335,706	1,458,850	4,334,829	4,286,157
Income (Loss) from operations	109,240	(217,165)	(964,576)	67,372
Other income (expense):
Interest expense	(92,351)	(60,537)	(235,398)	(182,510)
Other	75,236	53,884	190,155	116,181
Total other income (expense)	(17,115)	(6,653)	(45,243)	(66,329)
Income (Loss) from continuing operations before income taxes	92,125	(223,818)	(1,009,819)	1,043
Income tax expense (benefit)	50,477	(74,142)	(288,919)	236
Income (Loss) from continuing operations	41,648	(149,676)	(720,900)	807
Discontinued Operations
Income (loss) from operations of discontinued segment	(26,449)	(207,203)	(49,238)	(387,321)
Income tax expense (benefit)	(8,008)	(68,600)	(15,756)	(122,636)
Income (Loss) on discontinued operations	(18,441)	(138,603)	(33,482)	(264,685)
Net Income (Loss)	$ 23,207	$ (288,279)	$ (754,382)	$ (263,878)
Earnings (Loss) per share - Basic:
Continuing Operations (in dollars per share)	$ 0.01	$ (0.04)	$ (0.17)	$ 0
Discontinued Operations (in dollars per share)		(0.03)	(0.01)	(0.06)
Net Income (Loss) per share (in dollars per share)	0.01	(0.07)	(0.18)	(0.06)
Earnings (Loss) per share - Diluted:
Continuing Operations (in dollars per share)	0.01	(0.04)	(0.17)	0
Discontinued Operations (in dollars per share)		(0.03)	(0.01)	(0.06)
Net Income (Loss) per share (in dollars per share)	$ 0.01	$ (0.07)	$ (0.18)	$ (0.06)
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,161,421	4,105,704	4,148,966	4,093,993
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,161,421	4,105,704	4,148,966	4,093,993