Cash and Cash Equivalents (Tables)

3 Months Ended

Aug. 31, 2018

Cash and Cash Equivalents [Abstract]

Summary of cash and cash equivalents

	August 31, 2018		May 31, 2018
Cash in banks	$	4,346,317	$	4,723,700
Money market funds		605,369		599,737
	$	4,951,686	$	5,323,437