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Note 13 - Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Sep. 29, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended |
(In thousands, except per share amounts) |  | September 29, 2012 |  |  | October 1, 2011 |  |  | October 2, 2010 |
Earnings (loss) from continuing operations |  | $ | 1,809 |  |  | $ | (387 | ) |  | $ | 458 |
Less allocation to participating securities |  |  | - |  |  |  | - |  |  |  | (2 | )
Available to Insteel common shareholders |  | $ | 1,809 |  |  | $ | (387 | ) |  | $ | 456 |
Earnings from discontinued operations net of income taxes |  | $ | - |  |  | $ | - |  |  | $ | 15 |
Less allocation to participating securities |  |  | - |  |  |  | - |  |  |  | - |
Available to Insteel common shareholders |  | $ | - |  |  | $ | - |  |  | $ | 15 |
Net earnings (loss) |  | $ | 1,809 |  |  | $ | (387 | ) |  | $ | 473 |
Less allocation to participating securities |  |  | - |  |  |  | - |  |  |  | (2 | )
Available to Insteel common shareholders |  | $ | 1,809 |  |  | $ | (387 | ) |  | $ | 471 |
Basic weighted average shares outstanding |  |  | 17,664 |  |  |  | 17,562 |  |  |  | 17,466 |
Dilutive effect of stock-based compensation |  |  | 326 |  |  |  | - |  |  |  | 98 |
Diluted weighted average shares outstanding |  |  | 17,990 |  |  |  | 17,562 |  |  |  | 17,564 |
Per share basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations |  | $ | 0.10 |  |  | $ | (0.02 | ) |  | $ | 0.03 |
Loss from discontinued operations |  |  | - |  |  |  | - |  |  |  | - |
Net earnings (loss) |  | $ | 0.10 |  |  | $ | (0.02 | ) |  | $ | 0.03 |

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