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INCOME TAXES (Details) (USD $)
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 30, 2013
Income Taxes [Line Items]      
State income and foreign tax expenses $ 12,500us-gaap_IncomeTaxExpenseBenefit $ (143,000)us-gaap_IncomeTaxExpenseBenefit $ 143,000us-gaap_IncomeTaxExpenseBenefit
Net operating loss carryforwards available for tax purposes 71,000,000us-gaap_OperatingLossCarryforwards    
Unrecorded benefits from stock award $ 10,000,000kopn_UnrecognizedExcessTaxBenefitsFromStockBasedCompensation    
Minimum      
Income Taxes [Line Items]      
State income tax returns examination period 3 years    
Maximum      
Income Taxes [Line Items]      
State income tax returns examination period 5 years    
The state impact of any federal changes, subject to examination by various states (in years) 1 year