Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Net sales	$ 9,468,996	$ 9,250,308	$ 15,706,331	$ 17,665,413
Cost of goods sold	7,141,227	6,685,890	12,038,146	12,731,827
Gross profit	2,327,769	2,564,418	3,668,185	4,933,586
Expenses:
Engineering	118,361	101,125	231,899	203,692
Selling	639,893	483,782	1,176,043	973,519
General and administrative	1,125,624	1,180,552	2,111,288	2,244,662
Total expenses	1,883,878	1,765,459	3,519,230	3,421,873
Income (loss) from operations	443,891	798,959	148,955	1,511,713
Other income (expense):
Interest expense	(121,222)	(79,739)	(175,162)	(169,202)
Other	11,431	(9,443)	17,105	628,699
Total other income (expense)	(109,791)	(89,182)	(158,057)	459,497
Income (loss) before income taxes	334,100	709,777	(9,102)	1,971,210
Tax expense (benefit)	80,945	195,537	(3,943)	637,710
Net income (loss)	$ 253,155	$ 514,240	$ (5,159)	$ 1,333,500
Net income per share:
Basic net income (loss) per share (in Dollars per share)	$ 0.06	$ 0.13	$ 0.00	$ 0.33
Diluted net income (loss) per share (in Dollars per share)	$ 0.06	$ 0.13	$ 0.00	$ 0.33
Weighted average outstanding shares used to compute basic net income per share (in Shares)	4,047,487	4,037,552	4,047,025	4,036,302
Weighted average outstanding shares used to compute diluted net income per share (in Shares)	4,053,747	4,051,692	4,047,025	4,049,480