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v3.20.2

Note 17 - Concentration of Credit Risk (Details Textual) - USD ($) | Apr. 30, 2020 | Apr. 30, 2019
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Cash, Uninsured Amount | $ 5,202,000 | $ 1,597,000

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