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Note 10 - Income Taxes - Open Income Tax Years (Details)	12 Months Ended
	Jun. 30, 2017
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Open Tax Year	2014
Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Open Tax Year	2017
Canada Revenue Agency [Member] | Earliest Tax Year [Member]
Open Tax Year	2013
Canada Revenue Agency [Member] | Latest Tax Year [Member]
Open Tax Year	2017
Federal Ministry of Finance, Germany [Member] | Earliest Tax Year [Member]
Open Tax Year	2012
Federal Ministry of Finance, Germany [Member] | Latest Tax Year [Member]
Open Tax Year	2017
Revenue Commissioners, Ireland [Member] | Earliest Tax Year [Member]
Open Tax Year	2017
Revenue Commissioners, Ireland [Member] | Latest Tax Year [Member]
Open Tax Year	2017
Portuguese Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year	2014
Portuguese Tax Authority [Member] | Latest Tax Year [Member]
Open Tax Year	2017
Her Majesty's Revenue and Customs (HMRC) [Member] | Earliest Tax Year [Member]
Open Tax Year	2013
Her Majesty's Revenue and Customs (HMRC) [Member] | Latest Tax Year [Member]
Open Tax Year	2017

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

+ Details

Name:	us-gaap_OpenTaxYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:gYearItemType
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:	us-gaap_TaxPeriodAxis=us-gaap_EarliestTaxYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=us-gaap_LatestTaxYearMember
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: