Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Feb. 29, 2024	May 31, 2023
Current Assets:
Cash and cash equivalents	$ 5,319,000	$ 9,719,000
Accounts receivable, net	1,130,000	722,000
Inventories, net	2,129,000	2,056,000
Prepaid expenses and other	268,000	300,000
Total current assets	8,846,000	12,797,000
Property and equipment, net of accumulated depreciation and amortization	194,000	213,000
Right-of-use assets, net of accumulated amortization of $835,000 and $617,000 as of February 29, 2024 and May 31, 2023, respectively	817,000	1,035,000
Investments	165,000	165,000
Intangible assets, net of accumulated amortization of $44,000 and $30,000 as of February 29, 2024 and May 31, 2023, respectively	216,000	165,000
Other assets	104,000	79,000
Total Assets	10,342,000	14,454,000
Current Liabilities:
Accounts payable and accrued expenses	885,000	892,000
Accrued compensation	702,000	696,000
Advance from customers	85,000	60,000
Lease liabilities, current portion	319,000	297,000
Total current liabilities	1,991,000	1,945,000
Lease liabilities, net of current portion	543,000	785,000
Total Liabilities	2,534,000	2,730,000
Commitments and contingencies (Note 6)
Shareholders’ Equity:
Preferred stock, value
Common stock, $0.08 par value, 25,000,000 shares authorized, 16,821,646 issued and outstanding at February 29, 2024 and May 31, 2023, respectively	1,346,000	1,346,000
Additional paid-in capital	53,338,000	52,705,000
Accumulated other comprehensive loss	(102,000)	(110,000)
Accumulated deficit	(46,774,000)	(42,217,000)
Total Shareholders’ Equity	7,808,000	11,724,000
Total Liabilities and Shareholders’ Equity	10,342,000	14,454,000
Series A Preferred Stock [Member]
Shareholders’ Equity:
Preferred stock, value