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

Note 9 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
Note 9 - Income Taxes (Details Textual) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Income Tax Expense (Benefit), Total	$ 684,000	$ 123,000
Effective Income Tax Rate Reconciliation, Percent, Total	17.80%	19.70%
Unrecognized Tax Benefits, Ending Balance	$ 0

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