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v3.23.3

Note 8 - Long-term Debt (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Amortization of Financing Costs for Debt [Table Text Block] |
Fiscal year |  | In thousands |
2024 |  | $ | 50 |
2025 |  |  | 50 |
2026 |  |  | 51 |
2027 |  |  | 50 |
2028 |  |  | 23 |

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- Definition Tabular disclosure for a fiscal year schedule of the amortization of financing costs for debt. + References No definition available. + Details
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Namespace Prefix: | iiin_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration