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

Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
Note 9 - Income Taxes (Details Textual) - USD ($)	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Expense (Benefit), Total	$ 1,725,000	$ 763,000	$ 3,344,000	$ 1,076,000
Effective Income Tax Rate Reconciliation, Percent, Total	22.10%	20.30%	20.60%	20.20%
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.