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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
May 31, 2023
May 31, 2022
Cash flows from operating activities:    
Net loss $ (7,140,000) $ (4,531,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 84,000 339,000
Loss on disposal of property and equipment 53,000
Provision for allowance on accounts receivable 342,000 (684,000)
Inventory reserve (174,000) (772,000)
Share-based compensation 1,185,000 1,260,000
Amortization of right-of-use asset 267,000 256,000
Changes in assets and liabilities:    
Accounts receivable (291,000) 1,365,000
Inventories 534,000 1,562,000
Prepaid expenses and other 20,000 50,000
Other assets 18,000 169,000
Accounts payable and accrued expenses (80,000) 389,000
Accrued compensation 49,000 258,000
Advance from customers 9,000 51,000
Reduction in lease liabilities (297,000) (244,000)
Net cash used in operating activities (5,474,000) (479,000)
Cash flows from investing activities:    
Expenditure related to intangibles (14,000) (113,000)
Purchases of property and equipment (64,000) (57,000)
Net cash used in investing activities (78,000) (170,000)
Cash flows from financing activities:    
Gross proceeds from sale of common stock 10,014,000 2,402,000
Costs from sale of common stock (705,000) (85,000)
Proceeds from exercise of stock options 81,000 77,000
Net cash provided by financing activities 9,390,000 2,394,000
Effect of exchange rate changes in cash (36,000) (26,000)
Net increase in cash and cash equivalents 3,802,000 1,719,000
Cash and cash equivalents at beginning of year 5,917,000 4,199,000
Cash and cash equivalents at end of year 9,719,000 5,917,000
Cash paid during the year for:    
Income taxes 51,000 24,000
Non-cash investing and financing activities:    
Increase in right-of-use asset due to lease extension or establishment 4,000
Increase in lease liability due to lease extension or establishment 4,000
Write off of fixed assets, cost 40,000 820,000
Write off of fixed assets, accumulated depreciation 40,000 767,000
Write off of intangible assets, cost 6,000 247,000
Write off of intangible assets, accumulated amortization $ 6,000 $ 37,000