Marketable Securities (Schedule of Investment Securities In Continuous Unrealized Loss Position) (Details) - Corporate Equity Securities [Member] - USD ($)	Apr. 30, 2018	Jul. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Investment securities, continuous unrealized loss position, Fair Value	$ 120,188
Investment securities, continuous unrealized loss position, Less Than 12 Months	$ 13,792

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

No definition available.

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant