Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Sales	$ 6,886,077	$ 11,584,707	$ 21,979,317	$ 27,291,037
Cost of goods sold	5,620,719	8,880,619	16,454,087	20,918,763
Gross profit	1,265,358	2,704,088	5,525,230	6,372,274
Expenses:
Engineering	145,458	129,131	380,677	361,031
Selling	532,445	566,452	1,678,371	1,742,497
General and administrative	972,310	$ 1,100,733	3,107,737	$ 3,212,018
Accumulated impairment losses	(618,729)		(618,729)
Total expenses	2,268,948	$ 1,796,316	5,785,514	$ 5,315,546
Income from operations	(1,003,584)	907,772	(260,284)	1,056,728
Other income (expense):
Interest expense	(85,458)	(94,112)	(246,524)	(269,274)
Other	(96,058)	30,865	(79,456)	47,971
Total other income (expense)	(181,516)	(63,247)	(325,980)	(221,303)
Income (loss) before income taxes	(1,185,100)	844,525	(586,264)	835,425
Income tax expense (benefit)	(389,507)	286,317	(190,494)	282,374
Net income (loss)	$ (795,593)	$ 558,208	$ (395,770)	$ 553,051
Net income per share:
Basic net income (loss) per share (in dollars per share)	$ (0.20)	$ 0.14	$ (0.10)	$ 0.14
Diluted net income (loss) per share (in dollars per share)	$ (0.20)	$ 0.14	$ (0.10)	$ 0.14
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,061,052	4,048,552	4,057,496	4,047,544
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,061,052	4,053,129	4,057,496	4,053,152