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Document And Entity Information
 9 Months Ended
Jun. 30, 2012
Jul. 23, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name INSTEEL INDUSTRIES INC  
Document Type 10-Q  
Current Fiscal Year End Date --09-29  
Entity Common Stock, Shares Outstanding   17,690,518
Amendment Flag false  
Entity Central Index Key 0000764401  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Accelerated Filer  
Entity Well-known Seasoned Issuer No  
Document Period End Date Jun. 30, 2012  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3