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Note 2 - Stock Based Compensation (Details Textual) - USD ($) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2020 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Feb. 23, 2023
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  | $ 4,989,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 1 month 6 days |  |  |
Share-Based Payment Arrangement, Expense |  |  |  | $ 4,641,000 | $ 3,578,000 | $ 2,339,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  | 118,706 | 40,266 | 62,730 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  | 5 years | 5 years | 5 years |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  | 3 years | 3 years | 3 years |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  | $ 26.84 | $ 64.38 | $ 66.48 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  |  |  | 90,245 | 79,911 | 113,727 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period |  |  |  | 1,501 | 21,630 | 125,651 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  | $ 25,000 | $ 1,603,000 | $ 11,279,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  | $ 1,796,000 | $ 3,141,000 | $ 3,744,000 |
Stock Repurchased During Period, Shares |  |  |  | 15,879 | 12,862 | 13,292 |
Shares Acquired, Average Cost Per Share |  |  |  | $ 31.05 | $ 62.2 | $ 105.78 |
Payment, Tax Withholding, Share-Based Payment Arrangement |  |  |  | $ 493,000 | $ 1,220,000 | $ 1,406,000 |
Minimum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  |  |  | 3 years |
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  | 3 years |  |  |
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  | 6 years |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  | 5 years |  |  |
Cashless Method Stock Option Exercised [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period |  |  |  | 1,501 | 21,630 | 125,651 |
Restricted Stock [Member] |  |  |  |  |  |  |
Granted, unvested shares (in shares) |  |  |  | 137,928 | 41,492 | 29,512 |
Granted, weighted-average grant date fair value (in dollars per share) |  |  |  | $ 26.65 | $ 70.5 | $ 65.9 |
Performance Stock Units [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  | $ 0 |  |  |
Granted, unvested shares (in shares) |  |  |  | 47,745 |  |  |
Granted, weighted-average grant date fair value (in dollars per share) |  |  |  | $ 26.18 |  |  |
Bonus Stock Award [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |
Granted, unvested shares (in shares) |  |  |  | 0 | 9,144 | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share |  |  |  |  | $ 104.36 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  | $ 4,432,000 | $ 3,407,000 | $ 2,213,000 |
Cost of Sales [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  | $ 209,000 | $ 171,000 | $ 126,000 |
The 2022 Plan [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 1,461,461
Stock Compensation Plan 2007 [Member] | Restricted Stock [Member] | Minimum [Member] | Employees [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  | 1 year |  |  |
Stock Compensation Plan 2007 [Member] | Restricted Stock [Member] | Maximum [Member] | Employees [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  | 10 years |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Market Price Percentage, Offering Date |  |  |  | 85.00% |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 13,598 | 10,104 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price |  | $ 24.72 | $ 24.72 |  |  |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  |  |  | $ 175,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized | 200,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  | 144,548 |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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X
- Details
Name: | srt_TitleOfIndividualAxis=clfd_EmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=clfd_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |