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Note 8 - Debt (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2019	Mar. 31, 2025	Mar. 31, 2023
Term Loan [Member]
Debt Instrument, Term (Year)	364 days
Debt Instrument, Face Amount	$ 250.0
Amended and Restated Credit Agreement [Member]
Debt Instrument, Term (Year)		5 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 825.0	$ 500.0		$ 500.0
Line Of Credit, Accordion Feature		250.0
Line of Credit Facility, Remaining Borrowing Capacity			$ 169.1
Swing Line Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity		10.0
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 35.0
Standby Letters of Credit [Member]
Long-Term Line of Credit			$ 2.1

X

- Definition

Line of credit accordion feature.

+ References

No definition available.

+ Details

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Namespace Prefix:	sxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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