Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Net sales	$ 6,237,336	$ 8,415,104
Cost of goods sold	4,896,923	6,045,941
Gross profit	1,340,413	2,369,163
Expenses:
Engineering	113,539	102,567
Selling	536,149	489,736
General and administrative	985,661	1,064,112
Total expenses	1,635,349	1,656,415
Income (loss) from operations	(294,936)	712,748
Other income (expense):
Interest expense	(53,939)	(89,463)
Other	5,675	638,142
Total other income (expense)	(48,264)	548,679
Income (loss) before income taxes	(343,200)	1,261,427
Tax expense (benefit)	(84,888)	442,173
Net income (loss)	$ (258,312)	$ 819,254
Net income per share:
Basic net income (loss) per share (in Dollars per share)	$ (0.06)	$ 0.20
Diluted net income (loss) per share (in Dollars per share)	$ (0.06)	$ 0.20
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,046,552	4,035,052
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,046,552	4,047,134