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Document And Entity Information
9 Months Ended
Jun. 30, 2012
Jul. 17, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name Clearfield, Inc.  
Document Type 10-Q  
Current Fiscal Year End Date --09-30  
Entity Common Stock, Shares Outstanding   12,460,845
Amendment Flag false  
Entity Central Index Key 0000796505  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Jun. 30, 2012  
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q3