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Significant Accounting Policies (Policies) | 6 Months Ended
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Mar. 31, 2025
Accounting Policies [Abstract] |
Basis of Accounting, Policy [Policy Text Block] | Basis of Presentation The accompanying (a) condensed consolidated balance sheet as of September 30, 2024, which has been derived from audited financial statements, and (b) unaudited interim condensed consolidated financial statements as of and for the three and six months ended March 31, 2025 have been prepared by the Company in accordance with accounting principles generally accepted in the United States of America for interim financial information, pursuant to the rules and regulations of the Securities and Exchange Commission. In the opinion of management, the condensed consolidated financial statements include all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the financial position, results of operations, and cash flows of the interim periods presented. Operating results for the interim periods presented are not necessarily indicative of results to be expected for the full year or for any other interim period, due to variability in customer purchasing patterns, seasonality, and other factors. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended September 30, 2024. In preparation of the Company’s condensed consolidated financial statements, management is required to make estimates and assumptions that affect reported amounts of assets and liabilities and related revenues and expenses during the reporting periods. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates.
Consolidation, Policy [Policy Text Block] | Principles of Consolidation The condensed consolidated financial statements include the accounts of Clearfield, Inc. and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
New Accounting Pronouncements, Policy [Policy Text Block] | New Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. ASU 2023-07 is intended to enhance financial reporting by requiring incremental disclosures for significant segment expenses on an annual and interim basis by public entities required to report segment information in accordance with Accounting Standards Codification Topic 280. The amendments in ASU 2023-07 are to be applied retrospectively to all periods presented in the financial statements and early adoption is permitted. This standard will be applicable to the Company for the 2025 annual period and quarterly periods thereafter. The Company is evaluating its disclosure approach for ASU 2023-07 and anticipates adopting the standard for the year ended September 30, 2025, and filings thereafter. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The new guidance is expected to improve income tax disclosures primarily related to the rate reconciliation and income taxes paid information by requiring 1) consistent categories and greater disaggregation of information in the rate reconciliation and 2) income taxes paid disaggregated by jurisdiction. The guidance is effective on a prospective basis, although retrospective application and early adoption is permitted. The Company is evaluating its disclosure approach for ASU 2023-09 and anticipates adopting the standard for the annual period starting October 1, 2025. The FASB issued ASU No. 2024-03, (Subtopic 220-4012): Disaggregation of Income Statement Expenses. The ASU No. 2024-03 addresses the disaggregation of income statement expenses that aims to provide more detailed information about the types of expenses included in commonly presented expense captions, such as cost of sales, selling, general, and administrative expenses (SG&A), and research and development. The ASU 2024-04 can be applied either prospectively to financial statements issued for reporting periods after the effective date or retrospectively to any or all prior periods presented in the financial statements. The Company is evaluating its disclosure approach for ASU 2024-03 and anticipates adopting the standard for the annual period starting October 1, 2027.
Error Correction [Policy Text Block] | Correction of Prior Period Error As disclosed in Note 1 to Company’s 2024 Form 10-K, the Company identified a prior period error in the presentation of its Consolidated Statement of Cash Flows. Management determined its presentation of the net borrowings and repayments of factoring receivables was incorrectly presented within the ‘Accounts payable and accrued expenses’ line within operating activities as opposed to being presented within financing activities. As corrected in the Condensed Consolidated Statements of Cash Flows, accounts payable and accrued expenses and net cash provided by operating activities are each increased by $497,000 for the six months ended March 31, 2024, and net borrowings and repayments of factoring liability and net cash used in financing activities are each increased by $497,000 for the six months ended March 31, 2024. This correction had no impact on the previously reported condensed consolidated balance sheets, condensed consolidated statements of earnings, condensed consolidated statement of comprehensive income, or condensed consolidated statements of shareholders’ equity. The Company also will correct previously reported financial information for such immaterial errors in future filings, as applicable.

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- Definition Disclosure accounting policy for reporting error correction. + References No definition available. + Details
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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 + Details
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- Definition Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-1 + Details
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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
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