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Note 11 - Income Taxes - Open Income Tax Years (Details)	12 Months Ended
	Jun. 30, 2021
Internal Revenue Service (IRS) [Member] | Minimum [Member]
Open Tax Year	2018
Internal Revenue Service (IRS) [Member] | Maximum [Member]
Open Tax Year	2021
Canada Revenue Agency [Member] | Minimum [Member]
Open Tax Year	2017
Canada Revenue Agency [Member] | Maximum [Member]
Open Tax Year	2021
Federal Ministry of Finance, Germany [Member] | Minimum [Member]
Open Tax Year	2018
Federal Ministry of Finance, Germany [Member] | Maximum [Member]
Open Tax Year	2021
Revenue Commissioners, Ireland [Member]
Open Tax Year	2021
Portuguese Tax Authority [Member] | Minimum [Member]
Open Tax Year	2020
Portuguese Tax Authority [Member] | Maximum [Member]
Open Tax Year	2021
Her Majesty's Revenue and Customs (HMRC) [Member] | Minimum [Member]
Open Tax Year	2017
Her Majesty's Revenue and Customs (HMRC) [Member] | Maximum [Member]
Open Tax Year	2021

X

- Definition

Tax year that remains open to examination under enacted tax laws, in YYYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319

+ Details

Name:	us-gaap_OpenTaxYear
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:gYearListItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_CanadaRevenueAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_FederalMinistryOfFinanceGermanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_RevenueCommissionersIrelandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=sxi_PortugueseTaxAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_HerMajestysRevenueAndCustomsHMRCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: