Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.19.3.a.u2
Document And Entity Information - shares
3 Months Ended
Dec. 31, 2019
Jan. 17, 2020
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 Emerging Growth Company false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding (in shares)   13,657,459
Entity Shell Company false  
Document Type 10-Q  
Document Period End Date Dec. 31, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Title of 12(b) Security Common stock, par value $.01  
Entity Interactive Data Current Yes