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Note 17 - Employee Benefits - Company's Participation in Multiemployer Pension Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
New England Teamsters and Trucking Industry Pension Fund [Member] |  |  |
Multiemployer Plan, Period Contributions | $ 485 | $ 437 | $ 541
IAM National Pension Fund National Pension Plan [Member] |  |  |
Multiemployer Plan, Period Contributions | 575 | 633 | 659
Multiemployer Plan, Period Contributions | $ 1,060 | $ 1,070 | $ 1,200

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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_MultiemployerPlanNameAxis=sxi_IamNationalPensionFundNationalPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |