Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022
Cash flows from operating activities:
Net loss	$ (2,639,000)	$ (3,698,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	39,000	48,000
Provision (recovery) for allowance on accounts receivable	(7,000)	369,000
Inventory reserve	(174,000)	(72,000)
Share-based compensation	292,000	622,000
Amortization of right-of-use asset	144,000	134,000
Changes in assets and liabilities:
Accounts receivable	(338,000)	(445,000)
Inventories	390,000	427,000
Prepaid expenses and other	77,000	200,000
Other assets	(17,000)	16,000
Accounts payable and accrued expenses	(110,000)	(302,000)
Accrued compensation	(28,000)	50,000
Advance from customers		(2,000)
Reduction in lease liabilities	(145,000)	(133,000)
Net cash used in operating activities	(2,516,000)	(2,786,000)
Cash flows from investing activities:
Purchases of property and equipment	(27,000)	(58,000)
Expenditures related to intangibles	(48,000)
Net cash used in investing activities	(75,000)	(58,000)
Cash flows from financing activities:
Gross proceeds from sale of common stock		1,988,000
Costs from sale of common stock		(52,000)
Proceeds from exercise of stock options		79,000
Net cash provided by financing activities		2,015,000
Effect of exchange rate changes in cash	6,000	(21,000)
Net decrease in cash and cash equivalents	(2,585,000)	(850,000)
Cash and cash equivalents at beginning of year	9,719,000	5,917,000
Cash and cash equivalents at end of period	7,134,000	5,067,000
Cash paid during the period for:
Income taxes	30,000	3,000
Non-cash investing and financing activities:
Write off of intangible assets, cost		6,000
Write off of intangible assets, accumulated amortization		$ 1,000