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Note 3 - Business Combination - Pro forma Combined Results of Operations (Details) (ASW Acquisition [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 28, 2013
ASW Acquisition [Member]
 
Net sales $ 102,747us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= iiin_ASWAcquisitionMember
Earnings before income taxes 5,201us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= iiin_ASWAcquisitionMember
Net earnings $ 3,464us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= iiin_ASWAcquisitionMember