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Note 10 - Earnings (Loss) Per Share (Tables) | 9 Months Ended
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Jun. 30, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
(In thousands except per share amounts) |  | June 30, 2012 |  |  | July 2, 2011 |  |  | June 30, 2012 |  |  | July 2, 2011 |
Net earnings (loss) |  | $ | 894 |  |  | $ | 3,650 |  |  | $ | 976 |  |  | $ | (1,359 | )
Less allocation to participating securities |  |  | - |  |  |  | (6 | ) |  |  | - |  |  |  | - |
Available to Insteel common shareholders |  | $ | 894 |  |  | $ | 3,644 |  |  | $ | 976 |  |  | $ | (1,359 | )
Basic weighted average shares outstanding |  |  | 17,690 |  |  |  | 17,587 |  |  |  | 17,650 |  |  |  | 17,550 |
Dilutive effect of stock-based compensation |  |  | 303 |  |  |  | 268 |  |  |  | 339 |  |  |  | - |
Diluted weighted average shares outstanding |  |  | 17,993 |  |  |  | 17,855 |  |  |  | 17,989 |  |  |  | 17,550 |
Per share basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) |  | $ | 0.05 |  |  | $ | 0.21 |  |  | $ | 0.06 |  |  | $ | (0.08 | )
Per share diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) |  | $ | 0.05 |  |  | $ | 0.20 |  |  | $ | 0.05 |  |  | $ | (0.08 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration