Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.7.0.1
Document And Entity Information - shares
6 Months Ended
Mar. 31, 2017
Apr. 27, 2017
Document Information [Line Items]    
Entity Registrant Name Clearfield, Inc.  
Entity Central Index Key 0000796505  
Trading Symbol clfd  
Current Fiscal Year End Date --09-30  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   14,094,112
Document Type 10-Q  
Document Period End Date Mar. 31, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Amendment Flag false