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Note 20 - Subsequent Event (Details Textual) $ in Millions	Aug. 23, 2018 USD ($)
Tenibac-Graphion, Inc. [Member] | Subsequent Event [Member]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	$ 25

X

- Definition

Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sxi_TenibacgraphionIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: