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Note 16 - Rights Agreement (Details Textual) |  |  | 12 Months Ended
--- | --- | --- | ---
May 17, 1999 | Apr. 26, 1999 shares | Sep. 29, 2018 $ / shares
Dividend Distribution of Rights | shares |  | 1 |
Rights Assigned to Common Stock Issued | 1 |  |
Ownership Percentage to Trigger Rights Exercisable |  |  | 20.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 0.005
Portion of Company Sold Triggers Exercisability of Rights |  |  | 50.00%
Series A Junior Participating Preferred Stock [Member] |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 46

X
- Definition Represents dividend distribution of rights. + References No definition available. + Details
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Namespace Prefix: | iiin_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the beneficial ownership percentage that must be obtained by either a person or a group of affiliated or associates persons that will cause the rights distributed to be exercisable. + References No definition available. + Details
Name: | iiin_OwnershipPercentageToTriggerRightsExercisable
Namespace Prefix: | iiin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the portion of the Company that, if sold will trigger the exercisability of the rights. + References No definition available. + Details
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Namespace Prefix: | iiin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the number of rights that attach to each share of the Company's common stock that is issued after May 17, 1999. + References No definition available. + Details
Name: | iiin_RightsAssignedToCommonStockIssued
Namespace Prefix: | iiin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Period Type: | instant

X
- Details
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