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

Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
Note 9 - Income Taxes (Details Textual) - USD ($)	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Tax Expense (Benefit), Total	$ 935,000	$ 190,000	$ 1,619,000	$ 313,000
Effective Income Tax Rate Reconciliation, Percent, Total	20.40%	20.30%	19.20%	20.00%
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0

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