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Note 13 - Financing Receivables (Details Textual) € in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2024 EUR (€)
Factoring Liabilities | $ 2,920,000 | $ 6,289,000 | $ 4,391,000 |
Financing Receivables, Percentage of Cash Initially Received | 80.00% |  |  | 80.00%
Financing Receivable, Percentage of Balance Received When Invoice is Paid | 20.00% |  |  | 20.00%
Financing Receivable, Limit | $ 13,900,000 |  |  | € 12.5
Financing Receivable, Average Interest Rate During Period | 5.12% | 3.89% | 2.14% |
Minimum [Member] |  |  |  |
Agreement Termination Period (Month) | 0 months |  |  |
Minimum [Member] | Euribor [Member] |  |  |  |
Financing Receivable, Interest Rate, Basis Spread on Variable Rate | 0.75% |  |  |
Maximum [Member] |  |  |  |
Agreement Termination Period (Month) | 1 month |  |  |
Maximum [Member] | Euribor [Member] |  |  |  |
Financing Receivable, Interest Rate, Basis Spread on Variable Rate | 1.30% |  |  |

X
- Definition The termination period notice for agreements. + References No definition available. + Details
Name: | clfd_AgreementTerminationPeriod
Namespace Prefix: | clfd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of factoring liabilities. + References No definition available. + Details
Name: | clfd_FactoringLiabilities
Namespace Prefix: | clfd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The average interest rate during the period for financing receivable. + References No definition available. + Details
Name: | clfd_FinancingReceivableAverageInterestRateDuringPeriod
Namespace Prefix: | clfd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The basis spread on variable rate for interest rate of financing recievable. + References No definition available. + Details
Name: | clfd_FinancingReceivableInterestRateBasisSpreadOnVariableRate
Namespace Prefix: | clfd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of limit on financing receivable. + References No definition available. + Details
Name: | clfd_FinancingReceivableLimit
Namespace Prefix: | clfd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of balance received when the invoice is paid for financing receivable. + References No definition available. + Details
Name: | clfd_FinancingReceivablePercentageOfBalanceReceivedWhenInvoiceIsPaid
Namespace Prefix: | clfd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of cash initially received for financing receivable. + References No definition available. + Details
Name: | clfd_FinancingReceivablesPercentageOfCashInitiallyReceived
Namespace Prefix: | clfd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=clfd_EuriborMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |