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Note 12 - Contingencies (Details) (USD $)	3 Months Ended
	Mar. 29, 2014
Note 12 - Contingencies (Details) [Line Items]
Proceeds From Insurance Settlements	$ 1,300,000
Cost of Sales [Member]
Note 12 - Contingencies (Details) [Line Items]
Proceeds From Insurance Settlements	1,100,000
General and Administrative Expense [Member]
Note 12 - Contingencies (Details) [Line Items]
Proceeds From Insurance Settlements	$ 25,000

X

- Details

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Namespace Prefix:	iiin_
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Period Type:	duration

X

- Definition

Total cash received upon settlement of an insurance claim during the current period.

+ References

No definition available.

+ Details

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Namespace Prefix:	iiin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration