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Note 11 - Employee Benefits Plan (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
401(k) Plan [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 2.4 | $ 1.3 | $ 1.3
Provident Fund Plan and Gratuity Plan [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 1.7 | $ 1.4 | $ 1.1

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=qlys_FourZeroOnekPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=qlys_ProvidentFundPlanAndGratuityPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |