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Discontinued Operations (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jan. 27, 2014
Dec. 31, 2014
Dec. 31, 2012
Jun. 30, 2013
Dec. 31, 2013
Discontinued Operations [Line Items]          
Proceeds from sale of business $ 500us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates   $ 626us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates    
Loss on sale of discontinued operations, net of income taxes (120)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax (120)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax      
Other Assets Not Expected To Generate Significant Future Cash Flow [Member]          
Discontinued Operations [Line Items]          
Impairment charge       983iin_DiscontinuedOperationsAssetsImpairmentChargeDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= iin_OtherAssetsNotExpectedToGenerateSignificantFutureCashFlowMember
 
Accounts Receivable, Inventory, Fixed Assets And Other Assets [Member]          
Discontinued Operations [Line Items]          
Impairment charge         $ 717iin_DiscontinuedOperationsAssetsImpairmentChargeDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= iin_AccountsReceivableInventoryFixedAssetsAndOtherAssetsMember