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Note 8 - Long-term Debt - Amortization of Financing Costs (Details) $ in Thousands	Sep. 27, 2025 USD ($)
2026	$ 51
2027	50
2028	23
2029	0
2030	$ 0

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