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Note 3 - Business Combination (Details Textual) (USD $)
0 Months Ended
Aug. 15, 2014
Mar. 28, 2015
Dec. 27, 2014
Sep. 27, 2014
Restructuring Reserve   $ 1,172us-gaap_RestructuringReserve $ 1,155us-gaap_RestructuringReserve $ 1,208us-gaap_RestructuringReserve
Scenario, Forecast [Member]        
Restructuring Reserve   500,000us-gaap_RestructuringReserve
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
   
ASW Acquisition [Member]        
Business Combination, Consideration Transferred 33,500,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= iiin_ASWAcquisitionMember
     
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred 480,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= iiin_ASWAcquisitionMember
     
Accounts Payable and Accrued Liabilities [Member]        
Restructuring Reserve   600,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
  500,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Other Liabilities [Member]        
Restructuring Reserve   $ 600,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
  $ 700,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember