Leases (Details Textual)	12 Months Ended
	May 31, 2020 USD ($) Office	May 31, 2019 USD ($)
Leases (Textual)
Operating lease expense | $	$ 417,000	$ 388,000
Weighted average remaining lease term of operating leases	1 year 10 months 25 days
Number of offices | Office	3
Lease agreements expires, description	The lease agreements expire on December 31, 2020, February 28, 2021 and August 31, 2022, respectively, and do not include any renewal options.