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Note 1 - Summary of Accounting Policies - Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Jun. 30, 2019
Interest rate swaps		$ 0	$ 52
Foreign exchange contracts		2,477	3,052
Interest rate swaps		6,667	1,432
Contingent acquisition payments (a)	[1]	1,343	6,418
Fair Value, Inputs, Level 1 [Member]
Interest rate swaps		0	0
Foreign exchange contracts		0	0
Interest rate swaps		0	0
Contingent acquisition payments (a)	[1]	0	0
Fair Value, Inputs, Level 2 [Member]
Interest rate swaps		0	52
Foreign exchange contracts		2,477	3,052
Interest rate swaps		6,667	1,432
Contingent acquisition payments (a)	[1]	0	0
Fair Value, Inputs, Level 3 [Member]
Interest rate swaps		0	0
Foreign exchange contracts		0	0
Interest rate swaps		0	0
Contingent acquisition payments (a)	[1]	1,343	6,418
Deferred Compensation Plan [Member]
Marketable securities - deferred compensation plan		2,065	2,354
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable securities - deferred compensation plan		2,065	2,354
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Marketable securities - deferred compensation plan		0	0
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Marketable securities - deferred compensation plan		$ 0	$ 0
[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any deferred compensation that has been earned to date.

X

- Definition

The element representing the fair value of interest rate swaps.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

No definition available.

+ Details

Name:	us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=sxi_DeferredCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: