Note 18 - Divestitures - Summary of Components of Divestiture (Details) (Parentheticals)	Mar. 05, 2026
Federal Industries [Member] \| Discontinued Operations, Disposed of by Sale [Member]
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income, Extensible Enumeration, Not Disclosed [Flag]	false

Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income, Extensible Enumeration, Not Disclosed [Flag]

No definition available.

Name:	sxi_DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag
Namespace Prefix:	sxi_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration