Consolidated Statements of Operations (USD $)	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Net sales	$ 27,619,760	$ 28,951,378
Cost of goods sold	20,612,750	22,142,242
Gross profit	7,007,010	6,809,136
Expenses:
Engineering	433,766	417,521
Selling	1,703,072	1,810,522
General and administrative	2,940,408	2,686,065
Total expenses	5,077,246	4,914,108
Income from operations	1,929,764	1,895,028
Other income (expense):
Interest expense	(428,538)	(423,267)
Other	79,708	86,162
Total other income (loss)	(348,830)	(337,105)
Income before income taxes	1,580,934	1,557,923
Current tax expense	395,124	488,426
Deferred tax expense (benefit)	(63,085)	16,000
Net income	$ 1,248,895	$ 1,053,497
Net income per share:
Basic net income per share (in Dollars per share)	$ 0.31	$ 0.26
Diluted net income per share (in Dollars per share)	$ 0.31	$ 0.26
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,018,196	3,993,337
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,049,268	4,011,754