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Note 9 - Stockholders' Equity and Stock-based Compensation - Schedule of Repurchase Agreements (Details) - USD ($) $ in Billions	Mar. 31, 2022	Nov. 03, 2021	Feb. 10, 2021	May 07, 2020	Oct. 30, 2019	Oct. 30, 2018	Feb. 12, 2018
Authorized Dollar Value	$ 0.7						$ 0.1
October 30, 2018		$ 0.2	$ 0.1	$ 0.1	$ 0.1	$ 0.1

X

- Definition

Amount of additional stock repurchase plan authorized 1.

+ References

No definition available.

+ Details

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Namespace Prefix:	qlys_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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