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Note 17 - Concentration of Credit Risk (Details Textual) - USD ($)	Apr. 30, 2021	Apr. 30, 2020
Cash, Uninsured Amount	$ 2,742,000	$ 5,202,000

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