Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015
Sales	$ 5,741,088	$ 7,804,111	$ 12,133,086	$ 15,093,239
Cost of goods sold	4,241,153	5,596,379	8,930,851	10,833,376
Gross profit	1,499,935	2,207,732	3,202,235	4,259,863
Expenses:
Engineering	107,368	119,540	223,540	235,216
Selling	434,952	581,211	918,746	1,145,925
General and administrative	990,666	1,092,837	1,943,763	2,135,429
Total expenses	1,532,986	1,793,588	3,086,049	3,516,570
Income from operations	(33,051)	414,144	116,186	743,293
Other income (expense):
Interest expense	(60,153)	(81,582)	(134,185)	(161,067)
Other	17,745	21,445	62,744	16,581
Total other income (expense)	(42,408)	(60,137)	(71,441)	(144,486)
Income before income taxes	(75,459)	354,007	44,745	598,807
Income tax expense	(18,888)	122,386	20,344	198,991
Net income	$ (56,571)	$ 231,621	$ 24,401	$ 399,816
Net income per share:
Basic net income per share (in dollars per share)	$ (0.01)	$ 0.06	$ 0.01	$ 0.10
Diluted net income per share (in dollars per share)	$ (0.01)	$ 0.06	$ 0.01	$ 0.10
Weighted average outstanding shares used to compute basic net income per share (in shares)	4,101,810	4,060,775	4,088,073	4,055,698
Weighted average outstanding shares used to compute diluted net income per share (in shares)	4,101,810	4,062,294	4,088,073	4,057,073