XML 68 R54.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Note 8 - Long-term Debt - Amortized Financing Costs (Details) $ in Thousands | Oct. 01, 2016 USD ($)
--- | ---
2017 | $ 65
2018 | 65
2019 | 65
2020 | 41
2021 |

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