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Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2016	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

X

- Details

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