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Note 14 - Contingencies (Details Textual)	2 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2017	Mar. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Insurance Recoveries		$ 439,000
Cost of Sales [Member]
Insurance Recoveries			$ 418,000
Selling, General and Administrative Expenses [Member]
Insurance Recoveries			$ 21,000
Texas, Florida [Member]
Number of Facilities Affected by Hurricanes	4

X

- Definition

Represents the number of facilities affected by hurricanes.

+ References

No definition available.

+ Details

Name:	iiin_NumberOfFacilitiesAffectedByHurricanes
Namespace Prefix:	iiin_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GeographicDistributionAxis=iiin_TexasFloridaMember
Namespace Prefix:
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Period Type: