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Note 7 - Long-term Debt - Amortization of Financing Costs (Details) $ in Thousands | Sep. 29, 2018 USD ($)
--- | ---
2019 | $ 65
2020 | 41
2021 |
2022 |
2023 |

X
- Definition The amount of amortization costs in the next 12 months. + References No definition available. + Details
Name: | iiin_AmortizationOfFinancingCostsNext12Months
Namespace Prefix: | iiin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization costs in year 2. + References No definition available. + Details
Name: | iiin_AmortizationOfFinancingCostsYear2
Namespace Prefix: | iiin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization costs in year 3. + References No definition available. + Details
Name: | iiin_AmortizationOfFinancingCostsYear3
Namespace Prefix: | iiin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | iiin_AmortizationOfFinancingCostsYear4
Namespace Prefix: | iiin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization costs in year 5. + References No definition available. + Details
Name: | iiin_AmortizationOfFinancingCostsYear5
Namespace Prefix: | iiin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant