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Note 3 - Discontinued Operations - Assets and Liabilities Related to Discontinued Operations (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | ---
Other non-current assets | $ 14 | $ 14
Accrued expenses | 1,060 | 1,204
Accrued pension and other non-current liabilities |  | $ 55

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- Definition Non-current assets of discontinued operation. + References No definition available. + Details
Name: | sxi_AssetsOfDiscontinuedOperationNoncurrent
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accrued liabilities for the discontinued operation. + References No definition available. + Details
Name: | sxi_DiscontinuedOperationAccruedLiabilities
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Non-current liabilities of the discontinued operation. + References No definition available. + Details
Name: | sxi_LiabilitiesOfDiscontinuedOperationsNoncurrent
Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant