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Note 10 - Earnings (Loss) Per Share | 9 Months Ended
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Jun. 30, 2012
Earnings Per Share [Text Block] | (10) Earnings (Loss) Per Share The computations of basic and diluted earnings (loss) per share attributable to common shareholders for the three- and nine-month periods ended June 30, 2012 and July 2, 2011 are as follows:
|  | 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 | )
Options and RSUs representing 637,000 and 348,000 shares for the three-month periods ended June 30, 2012 and July 2, 2011, respectively, were antidilutive and were not included in the diluted earnings per share calculation. Options and RSUs representing 533,000 and 496,000 shares for the nine-month periods ended June 30, 2012 and July 2, 2011, respectively, were antidilutive and were not included in the diluted earnings per share calculation. Options, RSAs and RSUs representing 236,000 shares for the nine-month period ended July 2, 2011 were not included in the diluted earnings per share calculation due to the net loss that was incurred.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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