Consolidated Statements of Operations (USD $)	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Net sales	$ 34,226,553	$ 36,456,830
Cost of goods sold	25,860,107	26,424,567
Gross profit	8,366,446	10,032,263
Expenses:
Engineering	514,086	331,061
Selling	2,155,640	1,611,215
General and administrative	3,879,580	3,762,162
Total expenses	6,549,306	5,704,438
Income from operations	1,817,140	4,327,825
Other income (expense):
Interest expense	(296,640)	(413,594)
Other	685,344	73,796
Total other income (expense)	388,704	(339,798)
Income before income taxes	2,205,844	3,988,027
Current tax expense	654,468	1,322,940
Net income	$ 1,551,376	$ 2,665,087
Net income per share:
Basic net income per share (in Dollars per share)	$ 0.38	$ 0.66
Diluted net income per share (in Dollars per share)	$ 0.38	$ 0.66
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,039,530	4,032,643
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,049,791	4,049,516