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Note 11 - Employee Benefits Plan (Details Textual) - USD ($) $ in Millions	12 Months Ended
	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

X

- Details

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

X

- Details

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