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Note 5 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2017 | Oct. 01, 2016
--- | --- | ---
Non Financial [Member] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 0 | $ 0

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=iiin_NonFinancialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |