Clearfield, Inc. Quarterly report pursuant to Section 13 or 15(d)

Note 17 - Subsequent Events (Details Textual)

Note 17 - Subsequent Events (Details Textual)		1 Months Ended
Note 17 - Subsequent Events (Details Textual)	Jul. 31, 2021 USD ($) ft²	Apr. 30, 2024 USD ($) ft²	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)
Operating Lease, Right-of-Use Asset			$ 12,394,000	$ 13,861,000
Operating Lease, Liability			$ 12,859,000
Subsequent Event [Member] \| Old Lease For Facility in Tijuana, Mexico [Member]
Operating Lease, Right-of-Use Asset		$ 5,764,000
Operating Lease, Liability		5,764,000
Subsequent Event [Member] \| New Lease For Facility in Tijuana, Mexico [Member]
Operating Lease, Right-of-Use Asset		8,637,000
Operating Lease, Liability		$ 8,637,000
Tijuana, Mexico 3 [Member]
Area of Real Estate Property \| ft²	318,000
Lessee, Operating Lease, Term of Contract (Year)	7 years
Lessee, Operating Lease, Number of Options to Renew	2
Lessee, Operating Lease, Renewal Term	5 years
Operating Lease, Monthly Payment	$ 162,000
Operating Lease, Payments, Annual Increase, Percentage	2.00%
Tijuana, Mexico 3 [Member] \| Lease Mandatory Contractual Term [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years
Tijuana, Mexico 3 [Member] \| Subsequent Event [Member]
Area of Real Estate Property \| ft²		318,000
Lessee, Operating Lease, Term of Contract (Year)		7 years
Lessee, Operating Lease, Number of Options to Renew		2
Lessee, Operating Lease, Renewal Term		5 years
Operating Lease, Monthly Payment		$ 169,000
Operating Lease, Payments, Annual Increase, Percentage		2.00%
Tijuana, Mexico 3 [Member] \| Subsequent Event [Member] \| Lease Mandatory Contractual Term [Member]
Lessee, Operating Lease, Term of Contract (Year)		5 years