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Note 1 - Summary of Accounting Policies - Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable securities - deferred compensation plan	$ 2,333	$ 2,324
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Marketable securities - deferred compensation plan
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Marketable securities - deferred compensation plan
Deferred Compensation Plan [Member]
Marketable securities - deferred compensation plan	2,333	2,324
Fair Value, Inputs, Level 1 [Member]
Foreign Exchange contracts
Foreign Exchange contracts
Interest rate swaps
Fair Value, Inputs, Level 2 [Member]
Foreign Exchange contracts	11	844
Foreign Exchange contracts	94	193
Interest rate swaps	1,038	551
Fair Value, Inputs, Level 3 [Member]
Foreign Exchange contracts
Foreign Exchange contracts
Interest rate swaps
Foreign Exchange contracts	11	844
Foreign Exchange contracts	94	193
Interest rate swaps	$ 1,038	$ 551

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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 portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

+ Details

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

X

- Details

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

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: