Summary of Significant Accounting Policies (Details 1) - USD ($)	May 31, 2017	May 31, 2016
Summary of assets measured at fair value on recurring basis
Assets measured at fair value	$ 1,020,888	$ 1,553,272
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value	992,000	1,528,000
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value	28,888	25,272
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value	28,888	25,272
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Certificates of Deposit [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value	28,888	25,272
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value	992,000	1,528,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Certificates of Deposit [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value	992,000	1,528,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Certificates of Deposit [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value