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Note 9 - Long-Term Debt (Details Textual) (USD $)
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Sep. 27, 2014
Disclosure Text Block [Abstract]      
Amortization of Financing Costs $ 26,000us-gaap_AmortizationOfFinancingCosts $ 26,000us-gaap_AmortizationOfFinancingCosts  
Accumulated Amortization, Deferred Finance Costs 4,400,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts   4,400,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts
Letter of Credit [Member]      
Disclosure Text Block [Abstract]      
Letters of Credit Outstanding, Amount 1,500,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
   
Revolving Credit Facility [Member]      
Disclosure Text Block [Abstract]      
Long-term Line of Credit 10,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Line of Credit Facility, Remaining Borrowing Capacity 81,400,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Amortization of Financing Costs 26,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
26,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Line of Credit Facility, Current Borrowing Capacity 100,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Debt Instrument, Interest Rate, Increase (Decrease) 2.00%us-gaap_DebtInstrumentInterestRateIncreaseDecrease
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Fixed Charge Coverage Ratio 1.1iiin_FixedChargeCoverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Credit Facility Liquidity Amount $ 13,500,000iiin_CreditFacilityLiquidityAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Revolving Credit Facility [Member] | Base Rate [Member]      
Disclosure Text Block [Abstract]      
Line of Credit Facility, Interest Rate at Period End 0.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Disclosure Text Block [Abstract]      
Line of Credit Facility, Interest Rate at Period End 1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Revolving Credit Facility [Member] | Prime Rate [Member]      
Disclosure Text Block [Abstract]      
Debt Instrument, Basis Spread on Variable Rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
   
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]      
Disclosure Text Block [Abstract]      
Debt Instrument, Basis Spread on Variable Rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Disclosure Text Block [Abstract]      
Debt Instrument, Basis Spread on Variable Rate 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]      
Disclosure Text Block [Abstract]      
Debt Instrument, Basis Spread on Variable Rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Disclosure Text Block [Abstract]      
Debt Instrument, Basis Spread on Variable Rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember