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Note 13 - Financing Receivables (Details Textual) € in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 EUR (€) | Sep. 30, 2023 USD ($)
Factoring Liabilities | $ 5,714,000 | $ 5,714,000 |  | $ 6,289,000
Financing Receivables, Percentage of Cash Initially Received | 80.00% | 80.00% | 80.00% |
Financing Receivable, Percentage of Balance Received When Invoice is Paid | 20.00% | 20.00% | 20.00% |
Financing Receivable, Limit | $ 13,400,000 | $ 13,400,000 | € 12.5 |
Financing Receivable, Average Interest Rate During Period | 5.19% | 7.81% |  |
Minimum [Member] |  |  |  |
Financing Receivable, Interest Rate, Basis Spread on Variable Rate |  | 0.75% |  |
Agreement Termination Period (Month) |  | 0 months |  |
Maximum [Member] |  |  |  |
Financing Receivable, Interest Rate, Basis Spread on Variable Rate |  | 1.30% |  |
Agreement Termination Period (Month) |  | 1 month |  |

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: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |