Significant Accounting Policies (Details Narrative) - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Allowance for doubtful accounts	$ 103,029	$ 36,826
Depreciation expense	56,554	68,633
Amortizable intangible assets	2,085,362	2,200,883
Accumulated amortization of intangible assets	1,797,760	1,808,698
Amortization expense	104,583	104,583
Impairment of intangible assets	0	0
Advertising expense	$ 7,767	$ 22,018
Stock options excluded from computation of earnings per share	8,888	43,751
Minimum
Intangible assets useful life	5 years
Maximum
Intangible assets useful life	17 years
Furniture, Fixtures and Equipment | Minimum
Property and equipment useful life	3 years
Furniture, Fixtures and Equipment | Maximum
Property and equipment useful life	7 years
Vehicles
Property and equipment useful life	3 years
Buildings and Improvements
Property and equipment useful life	25 years
Shipping and Handling
Revenues	$ 29,707	$ 33,929