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Note 3 - Discontinued Operations - Assets and Liabilities Related to Discontinued Operations (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Other non-current assets	$ 14	$ 14
Accrued expenses	$ 747	$ 786

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