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

The amount of amortization costs in the next 12 months.

No definition available.

Name:	iiin_AmortizationOfFinancingCostsNext12Months
Namespace Prefix:	iiin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of amortization costs in year 2.

No definition available.

Name:	iiin_AmortizationOfFinancingCostsYear2
Namespace Prefix:	iiin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of amortization costs in year 3.

No definition available.

Name:	iiin_AmortizationOfFinancingCostsYear3
Namespace Prefix:	iiin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	iiin_AmortizationOfFinancingCostsYear4
Namespace Prefix:	iiin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of amortization costs in year 5.

No definition available.

Name:	iiin_AmortizationOfFinancingCostsYear5
Namespace Prefix:	iiin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant