Cash and Cash Equivalents (Tables)

6 Months Ended

Nov. 30, 2017

Cash and Cash Equivalents [Abstract]

Summary of cash and cash equivalents

	November 30, 2017		May 31, 2017
Cash in banks	$	3,691,221	$	4,634,245
Money market funds		589,682		840,731
Certificates of deposit		-		249,000
	$	4,280,903	$	5,723,976