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Note 15 - Discontinued Operations - Assets and Liabilities Related to Discontinued Operations (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | ---
Current assets |  |
Non-current assets | 14 | 14
Current liabilities | 786 | 1,204
Non-current liabilities |  | $ 55

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

X
- 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

X
- 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

X
- 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