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Note 13 - Earnings Per Share (Details Textual) - shares | 3 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Employee Stock Option [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0
Performance Shares [Member] |  |
Share-based Compensation Awards Excluded from Computation of Earnings Per Share Amount | 54,893 | 29,607

X
- Definition The number of share-based compensation awards that are excluded from computation of earnings per share as the performance criteria have not been met. + References No definition available. + Details
Name: | sxi_ShareBasedCompensationAwardsExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | sxi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |