Loan Payable (Details) $ in Thousands	6 Months Ended
Jan. 31, 2018 USD ($)
Debt Disclosure [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 8,000
Line of Credit Facility Additional Borrowings Capacity	4,000
Unamortized Debt Issuance Expense	$ 281
Line of Credit Facility Expiration Month and Year	December 7, 2016

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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