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Note 8 - Goodwill and Patents (Details Textual)	9 Months Ended
	Jun. 30, 2016
Patents [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Number of Patents Granted	6
Number of Patents Pending	5

X

- Definition

Represents the number of patents granted in the United States.

+ References

No definition available.

+ Details

Name:	clfd_NumberOfPatentsGranted
Namespace Prefix:	clfd_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of patents pending.

+ References

No definition available.

+ Details

Name:	clfd_NumberOfPatentsPending
Namespace Prefix:	clfd_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: