Consolidated Statements of Operations (USD $)	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Net sales	$ 36,456,830	$ 27,619,760
Cost of goods sold	26,424,567	20,612,750
Gross profit	10,032,263	7,007,010
Expenses:
Engineering	331,061	433,766
Selling	1,611,215	1,703,072
General and administrative	3,762,162	2,940,408
Total expenses	5,704,438	5,077,246
Income from operations	4,327,825	1,929,764
Other income (expense):
Interest expense	(413,594)	(428,538)
Other	73,796	79,708
Total other income (loss)	(339,798)	(348,830)
Income before income taxes	3,988,027	1,580,934
Current tax expense	1,364,661	201,632
Deferred tax expense	(41,721)	130,407
Net income	$ 2,665,087	$ 1,248,895
Net income per share:
Basic net income (loss) per share (in Dollars per share)	$ 0.66	$ 0.31
Diluted net income (loss) per share (in Dollars per share)	$ 0.66	$ 0.31
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,032,643	4,018,196
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,049,516	4,049,268