Clearfield, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Property, plant and equipment, gross	$ 30,906	$ 33,917
Less: Accumulated depreciation	(21,224)	(18,046)
Property, plant and equipment, net	$ 9,682	15,871
Equipment [Member] \| Minimum [Member]
Property, plant and equipment useful life (Year)	3 years
Property, plant and equipment useful life (Year)	3 years
Equipment [Member] \| Maximum [Member]
Property, plant and equipment useful life (Year)	15 years
Property, plant and equipment useful life (Year)	15 years
Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 17,176	17,073
Office Equipment [Member]
Property, plant and equipment, gross	4,457	4,040
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 6,259	6,078
Leasehold Improvements [Member] \| Minimum [Member]
Property, plant and equipment useful life (Year)	7 years
Property, plant and equipment useful life (Year)	7 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, plant and equipment useful life (Year)	10 years
Property, plant and equipment useful life (Year)	10 years
Vehicles [Member]
Property, plant and equipment useful life (Year)	3 years
Property, plant and equipment, gross	$ 550	439
Property, plant and equipment useful life (Year)	3 years
Construction in Progress [Member]
Property, plant and equipment, gross	$ 2,464	$ 6,287