Income Taxes (Details 1) - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Income Tax Disclosure [Abstract]
Federal tax expense, Current	$ (586,000)	$ (10,000)
State tax expense, Current	22,000	30,000
Provisions for income taxes, Current, Total	(564,000)	20,000
Federal tax expense, Deferred	16,000	(383,000)
State tax expense, Deferred	(164,000)	(175,000)
Provisions of income taxes, Deferred, Total	(148,000)	(558,000)
Federal provision for income taxes	(570,000)	(393,000)
State provision for income taxes	(142,000)	(145,000)
Provision for income taxes, Total	$ (712,000)	$ (538,000)