Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023
Cash flows from operating activities:
Net loss	$ (4,557,000)	$ (5,348,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	59,000	66,000
Recovery for allowance on accounts receivable	(6,000)	(136,000)
Inventory reserve	(181,000)	(38,000)
Share-based compensation	633,000	1,006,000
Amortization of right-of-use asset	218,000	202,000
Changes in assets and liabilities:
Accounts receivable	(402,000)	155,000
Inventories	109,000	390,000
Prepaid expenses and other	33,000	2,000
Other assets	(26,000)	17,000
Accounts payable and accrued expenses	(8,000)	(585,000)
Accrued compensation	6,000	(126,000)
Advance from customers	25,000	87,000
Reduction in lease liabilities	(220,000)	(203,000)
Net cash used in operating activities	(4,317,000)	(4,511,000)
Cash flows from investing activities:
Purchases of property and equipment	(27,000)	(64,000)
Expenditures related to intangibles	(64,000)
Net cash used in investing activities	(91,000)	(64,000)
Cash flows from financing activities:
Gross proceeds from sale of common stock		2,014,000
Costs from sale of common stock		(53,000)
Proceeds from exercise of stock options		79,000
Net cash provided by financing activities		2,040,000
Effect of exchange rate changes in cash	8,000	(37,000)
Net decrease in cash and cash equivalents	(4,400,000)	(2,572,000)
Cash and cash equivalents at beginning of year	9,719,000	5,917,000
Cash and cash equivalents at end of period	5,319,000	3,345,000
Cash paid during the period for:
Income taxes	34,000	38,000
Non-cash investing and financing activities:
Write off of intangible assets, cost		2,000
Write off of intangible assets, accumulated amortization		$ 2,000