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Note 10 - Share Repurchases (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 18, 2008 | Jun. 29, 2013
Stockholders' Equity Note Disclosure [Text Block] |  |
Stock Repurchase Program, Authorized Amount | $ 25.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 24.8

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

X
- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration