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Note 9 - Derivative Financial Instruments (Details) (USD $) | Mar. 31, 2014 | Jun. 30, 2013
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Interest Rate Swap [Member] |  |
Note 9 - Derivative Financial Instruments (Details) [Line Items] |  |
Derivative, Notional Amount | $ 45,000,000 |
Derivative, Average Fixed Interest Rate | 2.40% |
Foreign Exchange Contract [Member] |  |
Note 9 - Derivative Financial Instruments (Details) [Line Items] |  |
Outstanding forward contracts, unrealized gain loss | $ (1,900,000) | $ (1,400,000)

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | sxi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Outstanding forward contracts, net unrealized gain loss. + References No definition available. + Details
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Namespace Prefix: | sxi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant