Condensed Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Cash flow from operating activities:
Net income	$ (248,071)	$ (16,923)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	106,800	105,230
Changes in operating assets and liabilities:
Accounts receivable	(88,299)	(268,217)
Inventories	(222,689)	44,498
Prepaid expenses and other assets	(138,783)	93,009
Accounts payable	278,320	(20,771)
Accrued liabilities	(124,124)	(121,252)
Customer deposits	410,195	(295,134)
Net cash (used in) provided by operating activities	(26,651)	(479,560)
Cash flows from investing activities:
Purchase of property and equipment	(76,623)	(215,352)
Interest earned on certificates of deposit	(6,780)	0
Net cash used in investing activities	(83,403)	(215,352)
Cash flows from financing activities:
Proceeds from PPP loan	626,466	0
Net cash provided by financing activities	626,466	0
Net increase (decrease) in cash and cash equivalents	516,412	(694,912)
Cash and cash equivalents at beginning of year	2,714,764	4,733,510
Cash and cash equivalents at end of year	$ 3,231,176	$ 4,038,598