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SHAREHOLDERS' EQUITY (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 28 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2021 | Jan. 22, 2021 | Jan. 21, 2021 | Dec. 10, 2020 | Jul. 21, 2020 | Mar. 20, 2020 | Feb. 24, 2020 | Dec. 31, 2017 | Dec. 01, 2017 | Dec. 31, 2014 | Aug. 31, 2010 | May 31, 2021 | May 31, 2020 | Mar. 19, 2020 | May 21, 2021 | Feb. 29, 2020 | Feb. 11, 2020
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 409,459 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 6.73 |  |  |  |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |  | $ 102,255 | $ 223,534 |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  |  | 1,011,475 | 10,232,857 |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |  | 102,255 | 223,534 |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in Shares) |  |  |  | 64,584 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 184,000 |  |  |  |  |  |  |  |  |  |  | $ 1,354,609 | $ 538,587 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 6.73 | $ 4.47 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  | $ 501,000 | $ 589,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | 2,132,000 |  |  |  |  |  |  |  |  |  |  | 2,132,000 | 6,923,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | 1,872,000 |  |  |  |  |  |  |  |  |  |  | 1,872,000 | 4,442,000 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 2,156,000 |  |  |  |  |  |  |  |  |  |  | $ 2,156,000 |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  |  | 2 years 215 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  | 6 years 25 days |  |  |  |  |
General and Administrative Expense [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  | $ 956,898 | 416,953 |  |  |  |
Cost of Sales [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  | 204,509 | 66,444 |  |  |  |
Research and Development Expense [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  | 125,439 | 40,254 |  |  |  |
Selling and Marketing Expense [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  | $ 67,763 | $ 14,936 |  |  |  |
5% Convertible Preferred Stock [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in Shares) | 571,429 |  |  |  |  |  | 571,429 |  |  |  |  | 571,429 | 571,429 |  |  |  | 571,429
Conversion of Stock, Shares Converted (in Shares) |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) | $ 0.08 |  |  |  |  |  |  |  |  |  |  | $ 0.08 | $ 0.08 |  |  |  |
Preferred Stock, Dividends Per Share, Declared (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.175 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  | 137,958 |  |  |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |  |  | $ 223,534 |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  |  |  |  |  |  |  | $ 1,177,394 |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  |  | $ 1,011,475 |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 158,889 |  |  |  |  |
Common Stock [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |  | $ 102,255 |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |  | $ 86,750 |  |  |  |  |
Common Stock [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  |  |  |  |  |  |  |  | 10,232,857 | $ 6,997,935 |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,771,048 |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,674,943 |  |  |  |
Minimum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.82 |  |  |  |
Sale of Stock, Price Per Share (in Dollars per share) | 7.06 |  |  |  |  |  |  |  |  |  |  | $ 7.06 |  |  |  |  |
Minimum [Member] | Common Stock [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0.82 |  |  |  |  |
Minimum [Member] | Common Stock [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 2.33 |  |  |  |
Maximum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 3.90 |  |  |  |
Sale of Stock, Price Per Share (in Dollars per share) | $ 7.79 |  |  |  |  |  |  |  |  |  |  | 7.79 |  |  |  |  |
Maximum [Member] | Common Stock [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 3.62 |  |  |  |  |
Maximum [Member] | Common Stock [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in Dollars per share) |  |  |  |  |  |  |  |  | $ 0.08 |  |  |  | $ 9.08 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 86,750 | 137,958 |  |  |  |
Conversion of Stock, Shares Converted (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 321,429 | 250,000 |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |  | $ 6,940 | $ 11,037 |  |  |  |
Common Stock [Member] | 5% Convertible Preferred Stock [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in Shares) |  |  | 321,429 |  |  |  | 571,429 |  |  |  |  | 321,429 | 250,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) |  |  |  |  |  |  | $ 0.08 |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Amount Issued |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in Dollars per share) |  |  |  |  |  |  | $ 3.50 |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in Shares) |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Units (in Shares) |  |  |  |  | 571,429 |  |  |  |  |  |  |  |  |  |  |  |
2010 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  |  |  |  | 850,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
2014 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  |  |  | 850,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
2017 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
2020 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |
Registration Rights Agreement [Member] | Common Stock [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,817,330 |  |  |  |
Registration Rights Agreement [Member] | Maximum [Member] | Common Stock [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The value of the financial instrument issued [noncash or part noncash] in the conversion of stock. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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