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Note F - Employee Benefit Plan (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Note F - Employee Benefit Plan (Details) [Line Items] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars) | $ 379,630 | $ 290,652 | $ 283,600
First Three Percents Of Compensation [Member] |  |  |
Note F - Employee Benefit Plan (Details) [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% | 100.00% | 100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% | 3.00% | 3.00%
Second Two Percent Of Compensation [Member] |  |  |
Note F - Employee Benefit Plan (Details) [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% | 50.00% | 50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 2.00% | 2.00% | 2.00%

X
- Details
Name: | clfd_NoteFEmployeeBenefitPlanDetailsLineItems
Namespace Prefix: | clfd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration