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Note 15 - Leases - Operating Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Total lease expense	$ 851	$ 938	$ 1,778	$ 1,886
Cost of Sales 1 [Member]
Total lease expense	794	870	1,649	1,741
Selling, General and Administrative Expenses 1 [Member]
Total lease expense	$ 57	$ 68	$ 129	$ 145

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-4

+ Details

Name:	us-gaap_OperatingLeaseExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=clfd_CostOfSales1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=clfd_SellingGeneralAndAdministrativeExpenses1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: