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Note 13 - Line of Credit (Details Textual) - Revolving Credit Facility [Member] - Loan and Security Agreement With Bremer Bank, National Association [Member] $ in Millions | Apr. 27, 2022 USD ($)
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Line of Credit Facility, Maximum Borrowing Capacity | $ 40
Debt Instrument, Minimum Interest Rate Required | 1.80%
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio | 1.20
Debt Instrument, Covenant, Maximum Debt to Cash Flow Ratio | 2
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |
Debt Instrument, Basis Spread on Variable Rate | 1.85%

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- Definition Maximum debt to cash flow ratio required under debt instrument. + References No definition available. + Details
Name: | clfd_DebtInstrumentCovenantMaximumDebtToCashFlowRatio
Namespace Prefix: | clfd_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum debt service coverage ratio required under debt instrument. + References No definition available. + Details
Name: | clfd_DebtInstrumentCovenantMinimumDebtServiceCoverageRatio
Namespace Prefix: | clfd_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum interest rate required for debt instrument. + References No definition available. + Details
Name: | clfd_DebtInstrumentMinimumInterestRateRequired
Namespace Prefix: | clfd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=clfd_LoanAndSecurityAgreementWithBremerBankNationalAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |