Income Taxes (Details) - Schedule of the provision for income taxes computed at the federal statutory rates - USD ($)	12 Months Ended
	May 31, 2021	May 31, 2020
Schedule of the provision for income taxes computed at the federal statutory rates [Abstract]
Amounts at statutory federal tax rate, Amount	$ (144,000)	$ (380,000)
Amounts at statutory federal tax rate, %	(21.00%)	(21.00%)
Noncontrolling interest, Amount	$ (5,000)	$ (6,000)
Noncontrolling interest, %	(0.70%)	(0.30%)
State and local taxes, net of federal income tax effect, Amount	$ (23,000)	$ (147,000)
State and local taxes, net of federal income tax effect, %	(3.40%)	(8.10%)
Federal benefit of state NOL, Amount	$ 50,000
Federal benefit of state NOL, %	7.30%
Benefit of NOL at higher federal rate, Amount		$ (202,000)
Benefit of NOL at higher federal rate, %		(11.20%)
Non-deductible expenses and other, Amount	$ 13,000	$ 23,000
Non-deductible expenses and other, %	1.90%	1.30%
Provision for income taxes, Amount	$ (109,000)	$ (712,000)
Provision for income taxes, %	(15.90%)	(39.30%)