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Note 10 - Other Financial Data (Details) - Balance Sheet Information (Parentheticals) (USD $) In Thousands, unless otherwise specified | Dec. 28, 2013 | Sep. 28, 2013
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Balance Sheet Information [Abstract] |  |
Accumulated amortization | $ 257 | $ 163

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Namespace Prefix: | iiin_
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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