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Note 1 - Summary of Accounting Policies - Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Foreign exchange contracts |  | $ 255 | $ 2,477
Foreign exchange contracts |  | 1,222 |
Interest rate swaps |  | 3,096 | 6,667
Contingent consideration (a) | [1] | 3,333 | 1,343
Interest rate swaps |  |  | 0
Fair Value, Inputs, Level 1 [Member] |  |  |
Foreign exchange contracts |  | 0 | 0
Foreign exchange contracts |  | 0 |
Interest rate swaps |  | 0 | 0
Contingent consideration (a) | [1] | 0 | 0
Interest rate swaps |  |  | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Foreign exchange contracts |  | 255 | 2,477
Foreign exchange contracts |  | 1,222 |
Interest rate swaps |  | 3,096 | 6,667
Contingent consideration (a) | [1] | 0 | 0
Interest rate swaps |  |  | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Foreign exchange contracts |  | 0 | 0
Foreign exchange contracts |  | 0 |
Interest rate swaps |  | 0 | 0
Contingent consideration (a) | [1] | 3,333 | 1,343
Interest rate swaps |  |  | 0
Deferred Compensation Plan [Member] |  |  |
Marketable securities - deferred compensation plan |  | 2,988 | 2,065
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Marketable securities - deferred compensation plan |  | 2,988 | 2,065
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.

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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 contracts, and swaps. + References No definition available. + Details
Name: | sxi_ForeignCurrencyContractLiabilityFairValueDisclosure
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- 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

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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 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
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Namespace Prefix: |
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Period Type: |

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |