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Note 11 - Commitments (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Operating Leases, Rent Expense, Net | $ 8.0 | $ 6.6 | $ 6.1
Minimum [Member] |  |  |
Lease Initial Term | 1 year |  |
Maximum [Member] |  |  |
Lease Initial Term | 20 years |  |

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- Definition Represents the initial term of certain property and equipment under lease agreements. + References No definition available. + Details
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Namespace Prefix: | sxi_
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X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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Period Type: | duration

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- Details
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Period Type: |