Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock Based Compensation (Details)

v2.4.1.9
Note 4 - Stock Based Compensation (Details) (USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 4 - Stock Based Compensation (Details) [Line Items]    
Allocated Share-based Compensation Expense $ 283,627us-gaap_AllocatedShareBasedCompensationExpense $ 188,160us-gaap_AllocatedShareBasedCompensationExpense
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 4,968,406us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 9 years 292 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years 109 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 2,737,943us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 146 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 2,383,960us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1  
Proceeds from Stock Options Exercised $ 1,276us-gaap_ProceedsFromStockOptionsExercised $ 25,327us-gaap_ProceedsFromStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,450us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 20,400us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Restricted Stock [Member] | Minimum [Member]    
Note 4 - Stock Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year  
Restricted Stock [Member] | Maximum [Member]    
Note 4 - Stock Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years  
Restricted Stock [Member]    
Note 4 - Stock Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 3,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 13.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Employee Stock Purchase Plan [Member]    
Note 4 - Stock Based Compensation (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 10.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= clfd_EmployeeStockPurchasePlanMember
$ 8.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= clfd_EmployeeStockPurchasePlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 85.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
/ us-gaap_PlanNameAxis
= clfd_EmployeeStockPurchasePlanMember
 
Stock Issued During Period, Shares, Employee Stock Purchase Plans 10,097us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= clfd_EmployeeStockPurchasePlanMember
10,920us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= clfd_EmployeeStockPurchasePlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 175,559us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= clfd_EmployeeStockPurchasePlanMember