Shareholders' Equity (Details)	3 Months Ended
Aug. 31, 2017 $ / shares shares
Stockholders' Equity Note [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross \| shares	52,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares	$ 2.41

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration