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Note 4 - Investments (Details Textual) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	50
Debt Securities, Available for Sale, Other than Temporary Impairment	$ 0

X

- Definition

Represents other than temporary impairment of debt securities available for sale.

+ References

No definition available.

+ Details

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

X

- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-4

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant