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Note 16 - Contingencies (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 29, 2019 | Sep. 29, 2018
Fire [Member] |  |  |
Insurance Recoveries | $ 486,000 | $ 2,200,000 |
Insurance Settlements Receivable |  |  | $ 462,000
Fire [Member] | Cost of Sales [Member] |  |  |
Insurance Recoveries | 339,000 | 645,000 |
Fire [Member] | Other Income [Member] |  |  |
Insurance Recoveries | 144,000 | 1,100,000 |
Fire [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Insurance Recoveries | $ 3,000 | 48,000 |
Storm [Member] |  |  |
Insurance Recoveries |  | 150,000 |
Storm [Member] | Other Income [Member] |  |  |
Insurance Recoveries |  | $ 98,000 |

X
- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
Name: | us-gaap_InsuranceRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_FireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=iiin_StormMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |