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Note 3 - Fair Value Measurements - Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jun. 30, 2017
--- | --- | ---
Foreign exchange contracts |  | $ 1,794 | $ 399
Interest rate swaps |  | 1,107 | 3,777
Foreign exchange contracts |  | 7,877 | 3,232
Interest rate swaps |  |  | 3,958
Contingent acquisition payments (a) | [1] | 4,216 | 2,108
Fair Value, Inputs, Level 1 [Member] |  |  |
Foreign exchange contracts |  |  |
Interest rate swaps |  |  |
Foreign exchange contracts |  |  |
Interest rate swaps |  |  |
Contingent acquisition payments (a) | [1] |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Foreign exchange contracts |  | 1,794 | 399
Interest rate swaps |  | 1,107 | 3,777
Foreign exchange contracts |  | 7,877 | 3,232
Interest rate swaps |  |  | 3,958
Contingent acquisition payments (a) | [1] |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Foreign exchange contracts |  |  |
Interest rate swaps |  |  |
Foreign exchange contracts |  |  |
Interest rate swaps |  |  |
Contingent acquisition payments (a) | [1] | 4,216 | 2,108
Deferred Compensation Plan [Member] |  |  |
Marketable securities - deferred compensation plan |  | 2,399 | 2,397
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Marketable securities - deferred compensation plan |  | 2,399 | 2,397
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 |  |  |
[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.

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- 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

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- 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=35744584&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=6911338&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
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- 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

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- 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

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

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

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

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