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Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Payment for Contingent Consideration Liability, Financing Activities |  | $ 1,167 | $ (0)
GS Engineering [Member] |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 12,800 |
Renco Electronics [Member] |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | $ 2,200 |
Payment for Contingent Consideration Liability, Financing Activities | $ 1,200 |  |

X
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=sxi_GSEngineeringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=sxi_RencoElectronicsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |