Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Net sales	$ 11,584,707	$ 9,350,391	$ 27,291,037	$ 27,015,804
Cost of goods sold	8,880,619	7,622,322	20,918,763	20,354,149
Gross profit	2,704,088	1,728,069	6,372,274	6,661,655
Expenses:
Engineering	129,131	177,873	361,031	381,565
Selling	566,452	599,259	1,742,497	1,572,778
General and administrative	1,100,733	896,818	3,212,018	3,141,480
Total expenses	1,796,316	1,673,950	5,315,546	5,095,823
Income from operations	907,772	54,119	1,056,728	1,565,832
Other income (expense):
Interest expense	(94,112)	(60,379)	(269,274)	(229,581)
Other	30,865	55,447	47,971	684,146
Total other income (expense)	(63,247)	(4,932)	(221,303)	454,565
Income before income taxes	844,525	49,187	835,425	2,020,397
Tax expense	286,317	22,793	282,374	660,503
Net income	$ 558,208	$ 26,394	$ 553,051	$ 1,359,894
Net income per share:
Basic net income per share (in Dollars per share)	$ 0.14	$ 0.01	$ 0.14	$ 0.34
Diluted net income per share (in Dollars per share)	$ 0.14	$ 0.01	$ 0.14	$ 0.34
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,048,552	4,041,682	4,047,544	4,038,118
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,053,129	4,057,773	4,053,152	4,050,819