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Note 11 - Income Taxes - Open Income Tax Years (Details) | 12 Months Ended
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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: |

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

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- 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: |

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- 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: |