Discontinued Operations (Details 2) - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 4,343,008	$ 9,080,717
Cost of revenue	2,374,251	5,876,176
Gross profit	1,968,757	3,204,541
Operating expenses:
General, administration and sales	1,252,222	2,771,254
Research and development	35,920	72,208
Total operating expenses	1,288,142	2,843,462
Operating income	680,615	361,079
Other income (expense), net	(63,904)	(85,972)
Income before taxes	616,711	275,107
Provision for income taxes	(1,423)	17,665
Net income from discontinued operations	$ 618,134	$ 257,442