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Note 3 - Business Combination (Details Textual) (ASW Acquisition [Member], USD $) | 0 Months Ended |  |
--- | --- | --- | ---
Aug. 15, 2014 | Dec. 27, 2014 | Sep. 27, 2014
Disclosure Text Block [Abstract] |  |  |
Restructuring Reserve |  | $ 1,200,000 us-gaap_RestructuringReserve | $ 1,200,000 us-gaap_RestructuringReserve
Business Combination, Consideration Transferred | 33,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |
Accounts Payable and Accrued Liabilities [Member] |  |  |
Disclosure Text Block [Abstract] |  |  |
Restructuring Reserve |  | 500,000 us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = iiin_ASWAcquisitionMember | 500,000 us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = iiin_ASWAcquisitionMember
Other Liabilities [Member] |  |  |
Disclosure Text Block [Abstract] |  |  |
Restructuring Reserve |  | $ 700,000 us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = iiin_ASWAcquisitionMember | $ 700,000 us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_BusinessAcquisitionAxis = iiin_ASWAcquisitionMember

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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