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v3.10.0.1

Note 16 - Concentration of Credit Risk (Details Textual) - USD ($) | Jul. 31, 2018 | Jul. 31, 2017
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Cash, Uninsured Amount | $ 899,000 | $ 4,670,000

X
- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant