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Note 12 - Retirement Benefits (Details Textual) $ in Millions	Mar. 31, 2020 USD ($)
Pension Plan [Member]
Defined Benefit Plan Contributions By Employer, Deferred Under CARES Act	$ 1.5

X

- Definition

Amount of contribution deferred and to be received by defined benefit plan from employer which increases plan assets. Deferred under the CARES act.

+ References

No definition available.

+ Details

Name:	sxi_DefinedBenefitPlanContributionsByEmployerDeferredUnderCARESAct
Namespace Prefix:	sxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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