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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)		3 Months Ended		6 Months Ended
	May 31, 2020	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Cash, Uninsured Amount		$ 5,417,958		$ 5,417,958
Concentration Risk, Percentage		40.00%
Threshold Period Past Due for Write-off of Trade Accounts Receivable				90 days
Accounts Receivable, Credit Loss Expense (Reversal)		$ 481,142		$ 410,161	$ 3,571
Increase (Decrease) in Prepaid Supplies	$ 1,000,000
Inventory Valuation Reserves	67,000	78,000		78,000
Depreciation, Depletion and Amortization		25,843	$ 24,321	52,575	53,819
Amortization of Intangible Assets		$ 6,022	5,946	$ 11,860	11,726
Equity Method Investment, Ownership Percentage		6.00%		6.00%
Proceeds from Stock Options Exercised				$ 49,330	48,928
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)				171,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)				$ 7.46
Research and Development Expense		$ 586,403	$ 404,854	$ 1,261,096	$ 775,320
Deferred Tax Assets, Valuation Allowance	$ 3,175,000	$ 3,832,000		$ 3,832,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)		1,326,489	521,782	1,399,763	498,040
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares)		321,429		321,429
Minimum [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Useful Life				5 years
Maximum [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Useful Life				10 years
Distribution Rights [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life				18 years
Purchased Technology Rights [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life				10 years
Patents [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life				20 years
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage				35.10%	50.30%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage	80.00%			61.90%
Customer Concentration Risk [Member] | South America [Member] | Accounts Receivable [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage				37.10%
Supplier Concentration Risk [Member] | Cost of Goods and Service, Product and Service Benchmark [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage				56.00%	51.40%
Supplier Concentration Risk [Member] | Accounts Payable [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage	26.90%			26.50%
Share-based Payment Arrangement, Option [Member]
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)				30,000
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in Dollars per share)				$ 1.04
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in Dollars per share)				$ 3.62
Proceeds from Stock Options Exercised				$ 49,330
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)				171,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)				$ 7.46

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Details

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