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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Feb. 28, 2019	May 31, 2018
Allowance for doubtful accounts (in Dollars)	$ 70,887	$ 57,695
Accumulated depreciation and amortization (in Dollars)	$ 1,739,246	$ 1,661,128
Preferred Stock, No Par Value (in Dollars per share)	$ 0	$ 0
Preferred Stock, shares authorized	5,000,000	5,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common stock par value (in Dollars per share)	$ 0.08	$ 0.08
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	9,333,657	8,888,011
Common stock, shares outstanding	9,333,657	8,888,011

X

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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