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Note 8 - Employee Benefit Plans (Details Textual) (USD $) | 3 Months Ended
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Dec. 27, 2014
Disclosure Text Block [Abstract] |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | $ 182,000 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Pension Contributions | $ 52,000 us-gaap_PensionContributions
Supplemental Employee Retirement Plan [Member] |
Disclosure Text Block [Abstract] |
Defined Benefit Plan Number of Years in Average Annual Base Salary | 5 years
Supplemental Retirement Benefit Period | 15 years
Defined Benefit Plan Percent of Highest Average Salary Base | 50.00%iiin_DefinedBenefitPlanPercentOfHighestAverageSalaryBase / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Defined Benefit Plan Number of Years Preceding Retirement for Average Annual Base Salary Calculation | 10 years
Supplemental Employee Retirement Plan [Member] | Minimum [Member] |
Disclosure Text Block [Abstract] |
Defined Benefit Plan Employment Term | 30 years
Reduced SERP [Member] |
Disclosure Text Block [Abstract] |
Defined Benefit Plan Retirement Age | 65 years
Reduced SERP [Member] | Minimum [Member] |
Disclosure Text Block [Abstract] |
Defined Benefit Plan Employment Term | 10 years

X
- Definition The amount of time that a Participant must remain in continuous service with the Company to be eligible for supplemental retirement benefits. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanEmploymentTerm
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of consecutive years used to determine a Participants highest base salary in a supplemental employee retirement plan. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanNumberOfYearsInAverageAnnualBaseSalary
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan number of years preceding retirement for average annual base salary calculation + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanNumberOfYearsPrecedingRetirementForAverageAnnualBaseSalaryCalculation
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of a Participants highest average base salary that will be matched and payed out to the Participant as supplemental retirement benefits if they meet the continuous service requirement. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanPercentOfHighestAverageSalaryBase
Namespace Prefix: | iiin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum age that an employee may retire at to receive full benefits. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanRetirementAge
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The period of time that a Participant will be payed supplemental retirement benefits if they meet the continuous service requirement. + References No definition available. + Details
Name: | iiin_SupplementalRetirementBenefitPeriod
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=iiin_ReducedSerpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |