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Note 3 - Income Taxes - Valuation Allowance Activity (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Balance at Beginning of Year	$ 47,014	$ 104,858
Income Tax Benefit	(5,235)	10,448
Reversal for State NOL Expiration and Utilization	(41,779)	(68,292)
Balance at End of Year		$ 47,014

X

- Definition

Amount of adjustment to the deferred tax asset's valuation allowance pertaining to income tax benefits.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of the adjustment to the valuation allowance of deferred tax assets to enclose the information pertaining about the State NOL expiration.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant