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Note 13 - Treasury Stock and Repurchase Program (Details Textual) - USD ($)	Oct. 31, 2022	Oct. 21, 2022	May 31, 2022	Mar. 31, 2022	Jul. 31, 2021	Apr. 30, 2020
Stock Repurchase Program, Authorized Amount	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant