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Subsequent Events (Details) - Line of Credit - 2018 Credit Agreement - Subsequent Event | Aug. 08, 2018 USD ($)
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Subsequent Event [Line Items] |
Fixed charge coverage ratio | 1.1
Percent availability under revolving commitment | 12.50%
Percentage of stock pledged on credit agreement | 66.67%
Revolving credit agreement |
Subsequent Event [Line Items] |
Revolving credit facility, maximum borrowing capacity | $ 30,000,000
Accordion feature, increase limit | $ 10,000,000

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- Definition Line Of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
Name: | sif_LineOfCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix: | sif_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility, Availability Of Revolving Commitment, Fixed Charge Coverage Ratio Threshold + References No definition available. + Details
Name: | sif_LineOfCreditFacilityAvailabilityOfRevolvingCommitmentFixedChargeCoverageRatioThreshold
Namespace Prefix: | sif_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility, Covenant Terms, Fixed Charge Coverage Ratio + References No definition available. + Details
Name: | sif_LineofCreditFacilityCovenantTermsFixedChargeCoverageRatio
Namespace Prefix: | sif_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Line of Credit Facility, Stock Pledged, Non-U.S. Subsidiaries, Percentage + References No definition available. + Details
Name: | sif_LineofCreditFacilityStockPledgedNonU.S.SubsidiariesPercentage
Namespace Prefix: | sif_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=sif_A2018CreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |