Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Oct. 31, 2023	Oct. 31, 2022
Operating activities
Net loss	$ (735,000)	$ (993,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	80,000	84,000
Depreciation and amortization	37,000	30,000
Changes in operating assets and liabilities:
Accounts receivable	(62,000)	(51,000)
Inventories	(16,000)	(60,000)
Prepaid expenses	(39,000)	(36,000)
Accounts payable and accrued liabilities	274,000	124,000
Interest on note payable	21,000
Net cash used in operating activities	(440,000)	(902,000)
Investing activities
Purchases of property, plant and equipment		(37,000)
Net cash used in investing activities		(37,000)
Financing activities
Net proceeds from note payable to related parties	785,000
Net cash provided by financing activities	785,000
Net increase and (decrease) in cash and cash equivalents, and restricted cash	345,000	(939,000)
Cash and cash equivalents, and restricted cash at beginning of period	1,170,000	3,466,000
Cash and cash equivalents, and restricted cash at end of period	1,515,000	2,527,000
Reconciliation of cash and cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	1,440,000	2,452,000
Restricted cash	75,000	75,000
Total cash and cash equivalents and restricted cash	$ 1,515,000	$ 2,527,000