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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Net sales $ 15,257,000 $ 9,544,000 $ 36,316,000 $ 32,348,000
Cost of sales 10,198,000 6,814,000 23,881,000 23,778,000
Gross profit 5,059,000 2,730,000 12,435,000 8,570,000
Operating expenses:        
Engineering 411,000 429,000 1,044,000 1,553,000
Selling and general 3,452,000 2,521,000 8,099,000 7,423,000
Total operating expenses 3,863,000 2,950,000 9,143,000 8,976,000
Operating income (loss) 1,196,000 (220,000) 3,292,000 (406,000)
Other income 2,000 1,000 2,803,000 18,000
Income (loss) before provision (benefit) for income taxes 1,198,000 (219,000) 6,095,000 (388,000)
Provision (benefit) for income taxes 272,000 (137,000) 727,000 (148,000)
Consolidated net income (loss) $ 926,000 $ (82,000) $ 5,368,000 $ (240,000)
Earnings (loss) per share:        
Basic (in dollars per share) $ 0.09 $ (0.01) $ 0.54 $ (0.02)
Diluted (in dollars per share) $ 0.09 $ (0.01) $ 0.53 $ (0.02)
Weighted average shares outstanding:        
Basic (in shares) 9,979,578 9,714,700 9,955,193 9,661,054
Diluted (in shares) 10,150,396 9,714,700 10,131,172 9,661,054