Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information - shares
3 Months Ended
Dec. 31, 2023
Jan. 29, 2024
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Dec. 31, 2023  
Document Transition Report false  
Entity File Number 0-16106  
Entity Registrant Name Clearfield, Inc.  
Entity Incorporation, State or Country Code MN  
Entity Tax Identification Number 41-1347235  
Entity Address, Address Line One 7050 Winnetka Avenue North  
Entity Address, Address Line Two Suite 100  
Entity Address, City or Town Brooklyn Park  
Entity Address, State or Province MN  
Entity Address, Postal Zip Code 55428  
City Area Code 763  
Local Phone Number 476-6866  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol CLFD  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   14,706,671
Entity Central Index Key 0000796505  
Current Fiscal Year End Date --09-30  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Amendment Flag false