Income Taxes (Details) - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Income Tax Disclosure [Abstract]
Amounts at statutory federal tax rate, Amount	$ (380,000)	$ (386,000)
Noncontrolling interest, Amount	(6,000)	(8,000)
State and local taxes, net of federal income tax effect., Amount	(147,000)	(115,000)
Benefit of NOL at higher federal rate, Amount	(202,000)
Non-deductible expenses and other, Amount	23,000	(29,000)
Provision for income taxes, Amount	$ (712,000)	$ (538,000)
Amounts at statutory federal tax rate, %	(21.00%)	(21.00%)
Noncontrolling interest, %	(0.30%)	(0.40%)
State and local taxes, net of federal income tax effect., %	(8.10%)	(6.30%)
Benefit of NOL at higher federal rate, %	(11.20%)
Non-deductible expenses and other, %	1.30%	(1.60%)
Provision for income taxes, %	(39.90%)	(29.30%)