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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Cash flows from operating activities:    
Net loss $ (1,132,000) $ (2,072,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 21,000 29,000
Provision for allowance on accounts receivable 230,000
Inventory reserve (140,000) 136,000
Share-based compensation 170,000 304,000
Amortization of right-of-use asset 71,000 67,000
Changes in assets and liabilities:    
Accounts receivable (708,000) (388,000)
Inventories 319,000 358,000
Prepaid expenses and other 21,000 82,000
Other assets (17,000) 2,000
Accounts payable and accrued expenses (179,000) (301,000)
Accrued compensation (29,000) (55,000)
Advance from customers 100,000
Reduction in lease liabilities (71,000) (65,000)
Net cash used in by operating activities (1,674,000) (1,573,000)
Cash flows from investing activities:    
Purchases of property and equipment (21,000) (34,000)
Expenditures related to intangibles (42,000)
Net cash used in investing activities (63,000) (34,000)
Cash flows from financing activities:    
Gross proceeds from sale of common stock 1,811,000
Costs from sale of common stock (47,000)
Proceeds from exercise of stock options 14,000
Net cash provided by financing activities 1,778,000
Effect of exchange rate changes in cash 6,000 (13,000)
Net decrease (increase) in cash and cash equivalents (1,731,000) 158,000
Cash and cash equivalents at beginning of year 9,719,000 5,917,000
Cash and cash equivalents at end of the period 7,988,000 6,075,000
Cash paid during the period for:    
Income taxes 23,000 2,000
Non-cash investing and financing activities:    
Write off of intangible assets, cost 6,000
Write off of intangible assets, accumulated amortization $ 1,000