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Note B - Commitments and Facilities (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 25, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Nov. 13, 2014
Operating Leases, Rent Expense, Total |  | $ 869,000 | $ 768,000 | $ 658,000 |
Stock Repurchase Program, Authorized Amount | $ 12,000,000 |  |  |  | $ 8,000,000
Stock Repurchase Program, Increase in Authorized Amount | $ 4,000,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 5,409,326 |  |  |

X
- Definition The increase of the amount of stock repurchase plan authorized + References No definition available. + Details
Name: | clfd_StockRepurchaseProgramIncreaseInAuthorizedAmount
Namespace Prefix: | clfd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant