Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Sales	$ 7,804,111	$ 9,468,996	$ 15,093,239	$ 15,706,331
Cost of goods sold	5,596,379	7,141,227	10,833,376	12,038,146
Gross profit	2,207,732	2,327,769	4,259,863	3,668,185
Expenses:
Engineering	119,540	118,361	235,216	231,899
Selling	581,211	639,893	1,145,925	1,176,043
General and administrative	1,092,837	1,125,624	2,135,429	2,111,288
Total expenses	1,793,588	1,883,878	3,516,570	3,519,230
Income from operations	414,144	443,891	743,293	148,955
Other income (expense):
Interest expense	(81,582)	(121,222)	(161,067)	(175,162)
Other	21,445	11,431	16,581	17,105
Total other income (expense)	(60,137)	(109,791)	(144,486)	(158,057)
Income (loss) before income taxes	354,007	334,100	598,807	(9,102)
Income tax expense (benefit)	122,386	80,945	198,991	(3,943)
Net income (loss)	$ 231,621	$ 253,155	$ 399,816	$ (5,159)
Net income per share:
Basic net income (loss) per share (in dollars per share)	$ 0.06	$ 0.06	$ 0.10	$ 0
Diluted net income (loss) per share (in dollars per share)	$ 0.06	$ 0.06	$ 0.10	$ 0
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,060,775	4,047,487	4,055,698	4,047,025
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,062,294	4,053,747	4,057,073	4,047,025