Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012
Net sales	$ 9,350,391	$ 11,533,882	$ 27,015,804	$ 29,531,268
Cost of goods sold	7,622,322	8,109,820	20,354,149	21,473,360
Gross profit	1,728,069	3,424,062	6,661,655	8,057,908
Expenses:
Engineering	177,873	82,044	381,565	240,455
Selling	599,259	468,228	1,572,778	1,259,539
General and administrative	896,818	1,267,267	3,141,480	3,095,370
Total expenses	1,673,950	1,817,539	5,095,823	4,595,364
Income from operations	54,119	1,606,523	1,565,832	3,462,544
Other income (expense):
Interest expense	(60,379)	(129,751)	(229,581)	(331,817)
Other	55,447	18,403	684,146	58,005
Total other income (loss)	(4,932)	(111,348)	454,565	(273,812)
Income before income taxes	49,187	1,495,175	2,020,397	3,188,732
Current tax expense	22,793	515,724	660,503	1,079,803
Net income	$ 26,394	$ 979,451	$ 1,359,894	$ 2,108,929
Net income per share:
Basic net income per share (in Dollars per share)	$ 0.01	$ 0.24	$ 0.34	$ 0.52
Diluted net income per share (in Dollars per share)	$ 0.01	$ 0.24	$ 0.34	$ 0.52
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,041,682	4,035,852	4,038,118	4,031,828
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,057,773	4,052,246	4,050,819	4,049,236