Cash and Cash Equivalents (Tables)

3 Months Ended

Aug. 31, 2019

Cash and Cash Equivalents [Abstract]

Schedule of cash and cash equivalents

	August 31, 2019		May 31, 2019
Cash in banks	$	2,508,422	$	3,072,218
Money market funds		304,097		622,771
	$	2,812,519	$	3,694,989