Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Net sales	$ 8,415,104	$ 6,312,216
Cost of goods sold	6,045,941	4,835,995
Gross profit	2,369,163	1,476,221
Expenses:
Engineering	102,567	85,060
Selling	489,736	366,783
General and administrative	1,064,112	662,125
Total expenses	1,656,415	1,113,968
Income from operations	712,748	362,253
Other income (expense):
Interest expense	(89,463)	(93,041)
Other	638,142	19,865
Total other income (loss)	548,679	(73,176)
Income before income taxes	1,261,427	289,077
Current tax expense	442,173	57,075
Deferred tax expense		38,504
Net income	$ 819,254	$ 193,498
Net income per share:
Basic net income per share (in Dollars per share)	$ 0.20	$ 0.05
Diluted net income per share (in Dollars per share)	$ 0.20	$ 0.05
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,035,052	4,028,193
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,047,134	4,046,125