Consolidated Balance Sheets - USD ($)	May 31, 2023	May 31, 2022
Current Assets:
Cash and cash equivalents	$ 9,719,000	$ 5,917,000
Accounts receivable, net	722,000	774,000
Inventories, net	2,056,000	2,416,000
Prepaid expenses and other	300,000	320,000
Total current assets	12,797,000	9,427,000
Property and equipment, net of accumulated depreciation and amortization	213,000	214,000
Right-of-use assets, net of accumulated amortization of $617,000 and $725,000 as of May 31, 2023 and 2022, respectively	1,035,000	1,302,000
Investments	165,000	165,000
Intangible assets, net of accumulated amortization	165,000	170,000
Other assets	79,000	96,000
Total Assets	14,454,000	11,374,000
Current Liabilities:
Accounts payable and accrued expenses	892,000	972,000
Accrued compensation	696,000	647,000
Advance from customers	60,000	51,000
Lease liabilities, current portion	297,000	341,000
Total current liabilities	1,945,000	2,011,000
Lease liabilities, net of current portion	785,000	1,038,000
Total Liabilities	2,730,000	3,049,000
Commitments and contingencies (Note 9)
Shareholders’ Equity:
Preferred stock, value
Common stock, $0.08 par value, 25,000,000 shares authorized, 16,821,646 and 12,867,924 issued and outstanding at May 31, 2023 and 2022, respectively	1,346,000	1,029,000
Additional paid-in-capital	52,705,000	42,447,000
Accumulated other comprehensive loss	(110,000)	(74,000)
Accumulated deficit	(42,217,000)	(35,077,000)
Total Shareholders’ Equity	11,724,000	8,325,000
Total Liabilities and Shareholders’ Equity	14,454,000	11,374,000
Series A Preferred Stock [Member]
Shareholders’ Equity:
Preferred stock, value