Income Taxes (Details) - Schedule of temporary differences that give rise to significant portions of the deferred income tax - USD ($)	12 Months Ended
	May 31, 2021	May 31, 2020
Schedule of temporary differences that give rise to significant portions of the deferred income tax [Abstract]
Allowance for doubtful accounts receivable	$ 52,000	$ 52,000
Accrued compensation and other accrued expenses	26,000	23,000
Net operating loss carryforwards	421,000	487,000
Equipment and leasehold improvement depreciation and amortization	(32,000)	(3,000)
Unrealized gain	(8,000)	(10,000)
Legal settlement with investor	275,000	233,000
Non-cash stock compensation	70,000
Non-cash lease expense	36,000
Accumulated amortization	95,000
Other items, net	6,000	2,000
Total deferred income tax assets	$ 941,000	$ 784,000