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Note 8 - Employee Benefit Plans (Details Textual)	3 Months Ended
	Jan. 02, 2016 USD ($)
Minimum [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Employment Term	30 years
Minimum [Member] | Reduced SERP [Member]
Defined Benefit Plan Employment Term	10 years
Supplemental Employee Retirement Plan [Member]
Supplemental Retirement Benefit Period	15 years
Defined Benefit Plan Percent of Highest Average Salary Base	50.00%
Defined Benefit Plan Number of Years in Average Annual Base Salary	5 years
Defined Benefit Plan Number of Years Preceding Retirement for Average Annual Base Salary Calculation	10 years
Reduced SERP [Member]
Defined Benefit Plan Retirement Age	65 years
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 49,000
Defined Benefit Plan, Expected Contributions in Current Fiscal Year	$ 143,000

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

X

- 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

X

- 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

X

- Definition

Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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