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SHAREHOLDERS' EQUITY (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 12 Months Ended | 28 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2021 | Jan. 21, 2021 | 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, 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 Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | $ 377,391 | $ 200,470 |  |  |  |
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 | 6,923,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  |  |  |  |  |  | 1,872,000 | 4,442,000 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  |  |  | $ 1,208,000 |  |  |  |  |
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 |  |  |  |  |
Research and Development Expense [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | $ 64,491 | 17,892 |  |  |  |
General and Administrative Expense [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | 221,052 | 156,750 |  |  |  |
Selling and Marketing Expense [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | 18,035 | 2,933 |  |  |  |
Cost of Sales [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | $ 73,813 | $ 22,895 |  |  |  |
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
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 |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |
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 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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