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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 07, 2023 | May 31, 2023 | May 31, 2022 | Jan. 22, 2021
Product Information [Line Items] |  |  |  |
Accumulated deficit |  | $ 42,217,000 | $ 35,077,000 |
Cash and cash equivalents |  | 9,719,000 | 5,917,000 |
Working capital |  | 10,852,000 |  |
Shelf registration statement maximum authorized common stock issuance value |  |  |  | $ 15,000,000
Proceeds from issuance of common stock |  | 10,014,000 | 2,402,000 |
Sale of stock expenses | $ 700,000 |  |  |
Revenues |  | 5,339,000 | 18,871,000 |
Other receivables, gross, current |  | 751,000 | 927,000 |
Inventory, gross |  | 2,728,000 | 3,262,000 |
Property, plant and equipment, net |  | $ 213,000 | 214,000 |
Threshold period past due for write-off of trade accounts receivable |  | 90 days |  |
Accounts receivable, credit loss expense (Reversal) |  | $ 29,000 | 153,000 |
Prepaid expense and other assets |  | 300,000 | 320,000 |
Inventory reserves |  | 672,000 | 846,000 |
Depreciation, depletion and amortization |  | 84,000 | 339,000 |
Amortization of intangible assets |  | 18,000 | 239,000 |
Asset impairment charges |  | 0 | 210,000 |
Investments |  | 165,000 | 165,000 |
Share-based payment arrangement, expense |  | 1,185,000 | 1,260,000 |
Proceeds from customers |  | 60,000 |  |
Research and development expense |  | 1,584,000 | 1,812,000 |
Deferred tax assets, valuation allowance |  | 8,940,000 | 6,967,000 |
Deferred tax assets, net |  | 8,940,000 | 6,967,000 |
Advertising expense |  | $ 156,000 | $ 76,000 |
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) |  | 2,342,616 | 2,321,616 |
Polish Distributor [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Investments |  | $ 165,000 |  |
Equity method investment, ownership percentage |  | 6.00% |  |
Marketing and Distribution Rights [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  | 18 years |  |
Purchased Technology Rights [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  | 10 years |  |
Patents [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  | 20 years |  |
Property, Plant and Equipment [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Depreciation, depletion and amortization |  | $ 66,000 | $ 100,000 |
MEXICO |  |  |  |
Product Information [Line Items] |  |  |  |
Inventory, gross |  | 626,000 | 621,000 |
Property, plant and equipment, net |  | $ 17,000 | $ 17,000 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Distributor One [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk, percentage |  | 35.00% |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Distributor Two [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 65.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Distributor [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk, percentage |  | 35.00% | 55.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Distributor [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk, percentage |  | 36.00% | 50.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributors In Asia [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk, percentage |  | 100.00% |  |
Cost of Goods and Service, Product and Service Benchmark [Member] | Supplier Concentration Risk [Member] | One Vendor [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 84.00% |
Minimum [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 5 years |  |
Maximum [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 10 years |  |
ATM Agreement [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sale of stock, number of shares issued in transaction |  | 573,889 | 521,267 |
Sale of stock, consideration received on transaction |  | $ 2,014,000 | $ 2,402,000 |
Proceeds from issuance of common stock | 7,300,000 | 1,961,000 | 2,317,000 |
Sale of stock expenses | $ 700,000 | $ 53,000 | $ 85,000 |
Net proceeds from ATM (in Shares) | 3,333,333 |  |  |
Share price | $ 2.40 |  |  |
ATM Agreement [Member] | Minimum [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sale of stock, price per share |  | $ 3.15 | $ 4.02 |
ATM Agreement [Member] | Maximum [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Sale of stock, price per share |  | $ 4.26 | $ 5.63 |

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