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Note 9 - Earnings Per Share (Tables) | 9 Months Ended
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Jun. 29, 2013
Earnings Per Share [Text Block] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
(In thousands except per share amounts) |  | June 29, 2013 |  |  | June 30, 2012 |  |  | June 29, 2013 |  |  | June 30, 2012 |
Net earnings available to common shareholders |  | $ | 3,274 |  |  | $ | 894 |  |  | $ | 9,390 |  |  | $ | 976 |
Basic weighted average shares outstanding |  |  | 18,066 |  |  |  | 17,690 |  |  |  | 17,879 |  |  |  | 17,650 |
Dilutive effect of stock-based compensation |  |  | 431 |  |  |  | 303 |  |  |  | 411 |  |  |  | 339 |
Diluted weighted average shares outstanding |  |  | 18,497 |  |  |  | 17,993 |  |  |  | 18,290 |  |  |  | 17,989 |
Per share basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  | $ | 0.18 |  |  | $ | 0.05 |  |  | $ | 0.53 |  |  | $ | 0.06 |
Per share diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  | $ | 0.18 |  |  | $ | 0.05 |  |  | $ | 0.51 |  |  | $ | 0.05 |

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Namespace Prefix: | iiin_
Data Type: | xbrli:stringItemType
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration