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Note 12 - Business Segment Information (Details) | 9 Months Ended
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Jun. 29, 2013
Segment Reporting Disclosure [Text Block] |
Number of Reportable Segments | 1

X
- Details
Name: | iiin_SegmentReportingDisclosureTextBlockAbstract
Namespace Prefix: | iiin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration