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Note 3 - Cash, Cash Equivalents and Investments (Details Textual)	3 Months Ended
	Dec. 31, 2018
Maximum [Member]
Held-to-maturity Securities, Investment Term	5 years

X

- Definition

Represents information about the Company's investment term in money market accounts and bank certificates of deposit.

+ References

No definition available.

+ Details

Name:	clfd_HeldtomaturitySecuritiesInvestmentTerm
Namespace Prefix:	clfd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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