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Derivative Instruments - (Details Textual) - Mexican Peso Forward Contracts | 6 Months Ended
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Dec. 31, 2017
Derivative [Line Items] |
Forward contract settlement dates, beginning | Oct. 16, 2015
Forward contract settlement dates, ending | Jun. 15, 2018

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- Definition The date the derivative contract settlements begin - in CCYY-MM-DD format. + References No definition available. + Details
Name: | strt_DerivativeContractSettlementDatesBeginning
Namespace Prefix: | strt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition The date the derivative contract settlements end - in CCYY-MM-DD format. + References No definition available. + Details
Name: | strt_DerivativeContractSettlementDatesEnding
Namespace Prefix: | strt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |