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Note 10 - Stockholders' Equity and Stock-based Compensation - Schedule of Repurchase Agreements (Details) - USD ($) $ in Billions | Dec. 31, 2021 | 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
Name: | qlys_StockRepurchaseProgramAdditionalAuthorizedAmount1
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