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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