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Note 15 - Earnings Per Share (Details Textual) - shares	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0	0	0	0
Performance Shares [Member]
Share-based Compensation Awards Excluded from Computation of Earnings Per Share Amount (in shares)			129,427	79,390

X

- Definition

The number of share-based compensation awards that are excluded from computation of earnings per share as the performance criteria have not been met.

+ References

No definition available.

+ Details

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Namespace Prefix:	sxi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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Period Type:	duration

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- Details

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Balance Type:
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X

- Details

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Namespace Prefix:
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Balance Type:
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