Marketable Securities (Details) (USD $)	Feb. 28, 2014	May 31, 2013
Summary of assets measured at fair value on recurring basis
Assets measured at fair value, Total	$ 1,512,808	$ 2,008,424
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value, Total	1,493,000	1,989,000
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value, Total	19,808	19,424
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value, Total	19,808	19,424
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, Total
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, Total	19,808	19,424
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value, Total	1,493,000	1,989,000
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, Total	1,493,000	1,989,000
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, Total
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Summary of assets measured at fair value on recurring basis
Assets measured at fair value, Total
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, Total
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, Total