v3.26.1

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Offering costs	$ 0.5	$ 0.5

X

- Definition

Stock offering costs.

+ References

No definition available.

+ Details

Name:	kalv_StockOfferingCosts
Namespace Prefix:	kalv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration