Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Net sales	$ 11,057,000	$ 10,390,000	$ 21,059,000	$ 22,804,000
Cost of sales	6,287,000	7,804,000	13,683,000	16,965,000
Gross profit	4,770,000	2,586,000	7,376,000	5,839,000
Operating expenses:
Engineering	202,000	528,000	633,000	1,124,000
Selling and general	1,884,000	2,246,000	4,647,000	4,902,000
Total operating expenses	2,086,000	2,774,000	5,280,000	6,026,000
Operating income (loss)	2,684,000	(188,000)	2,096,000	(187,000)
Other income	2,809,000	7,000	2,800,000	18,000
Income (loss) before provision (benefit) for income taxes	5,493,000	(181,000)	4,896,000	(169,000)
Provision (benefit) for income taxes	648,000	3,000	454,000	(11,000)
Consolidated net income (loss)	$ 4,845,000	$ (184,000)	$ 4,442,000	$ (158,000)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.49	$ (0.02)	$ 0.45	$ (0.02)
Diluted (in dollars per share)	$ 0.48	$ (0.02)	$ 0.44	$ (0.02)
Weighted average shares outstanding:
Basic (in shares)	9,963,291	9,704,880	9,927,776	9,633,935
Diluted (in shares)	10,129,472	9,704,880	10,096,916	9,633,935