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Note 2 - Acquisitions - Components of Acquisition Related Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Deferred compensation arrangements | $ 703 | $ 703 | $ 1,405 | $ 703
Acquisition-related costs |  | 800 | 303 | 800
Total | $ 703 | $ 1,503 | $ 1,708 | $ 1,503

X
- Definition This element represents acquisition-related costs incurred due to the effect of deferred compensation arrangements made in the course of the acquisition. + References No definition available. + Details
Name: | sxi_BusinessCombinationDeferredCompensationArrangements
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the total amount of costs incurred in facilitating an acquisition. + References No definition available. + Details
Name: | sxi_BusinessCombinationTotalCosts
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration