Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Sales	$ 6,591,829	$ 6,464,854	$ 17,702,628	$ 16,936,510
Cost of goods sold	4,853,408	5,539,974	13,199,471	14,039,752
Gross profit	1,738,421	924,880	4,503,157	2,896,758
Expenses:
Engineering	143,629	128,813	387,147	361,258
Selling	532,232	370,236	1,549,164	1,227,144
General and administrative	902,356	939,125	2,626,383	3,215,963
Total expenses	1,578,217	1,438,174	4,562,694	4,804,365
Income (Loss) from operations	160,204	(513,294)	(59,537)	(1,907,607)
Other income (expense):
Interest expense	(90,440)	(73,422)	(223,911)	(233,942)
Other	2,041	58,847	36,682	72,744
Total other income (expense)	(88,399)	(14,575)	(187,229)	(161,198)
Income (Loss) before income taxes	71,805	(527,869)	(246,766)	(2,068,805)
Income tax expense (benefit)	15,349	(104,258)	(52,074)	(406,282)
Net Income (Loss)	$ 56,456	$ (423,611)	$ (194,692)	$ (1,662,523)