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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Increase (Decrease) in Accounts Payable and Accrued Liabilities	$ (5,328,000)	$ (2,108,000)
Net Cash Provided by (Used in) Financing Activities	$ (6,388,000)	(15,142,000)
Revision of Prior Period, Error Correction, Adjustment [Member]
Increase (Decrease) in Accounts Payable and Accrued Liabilities		2,972,000
Proceeds from (Repayments of) Debt		2,972,000
Proceeds from (Payments for) Factoring Liability		2,972,000
Previously Reported [Member]
Net Cash Provided by (Used in) Financing Activities		$ 2,972,000

X

- Definition

Amount of cash inflow (outflow) from factoring liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	clfd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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X

- Definition

Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-24

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X

- Definition

The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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