Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Major Customer Concentration (Details) - Customers Comprising 10% or More of Net Sales

v2.4.1.9
Note 7 - Major Customer Concentration (Details) - Customers Comprising 10% or More of Net Sales (Sales Revenue, Net [Member], Customer Concentration Risk [Member])
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Customer A [Member]    
Concentration Risk [Line Items]    
Customer 23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= clfd_CustomerAMember 		11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= clfd_CustomerAMember
Customer B [Member]    
Concentration Risk [Line Items]    
Customer    [1] 48.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= clfd_CustomerBMember
[1] Less than 10%