Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
	Feb. 29, 2012	Feb. 28, 2011
Net sales	$ 6,312,216	$ 4,664,338
Cost of goods sold	4,835,995	4,188,503
Gross profit	1,476,221	475,835
Expenses:
Engineering	85,060	118,309
Selling	366,783	400,608
General and administrative	662,125	615,874
Total expenses	1,113,968	1,134,791
Income (loss) from operations	362,253	(658,956)
Other income (expense):
Interest expense	(93,040)	(96,202)
Other	19,865	26,069
Total other income (loss)	(73,175)	(70,133)
Income (loss) before income taxes	289,078	(729,089)
Current tax expense (benefit)	57,076	(314,512)
Deferred tax expense	38,504	70,000
Net income (loss)	$ 193,498	$ (484,577)
Net income per share:
Basic net income (loss) per share	$ 0.05	$ (0.12)
Diluted net income (loss) per share	$ 0.05	$ (0.12)
Weighted average outstanding shares used to compute basic net income per share	4,028,193	4,010,068
Weighted average outstanding shares used to compute diluted net income per share	4,046,125	4,010,068